The Historical Reason a Score Means 20 Years

A score is a unit of time equivalent to 20 years. While it is rarely used in common conversation today, it remains one of the most resonant numerical terms in the English language due to its deep historical, linguistic, and literary roots. To understand why a score means 20, one must look past modern decimal mathematics and explore ancient methods of tallying, the evolution of Germanic languages, and the rhetorical traditions of the 19th century.

Defining the Score as a Unit of Measurement

In its most basic form, a score represents the number 20. Just as a dozen represents 12 and a gross represents 144, a score is a fixed collective noun used for counting. When applied to time, one score equals 20 years, two score equals 40 years, and so on.

This unit belongs to a vigesimal system, which is a numeral system based on twenty. Most modern societies use a decimal system (base-10), likely because humans have ten fingers. However, many ancient cultures utilized both fingers and toes for counting, leading to the development of base-20 systems. The term "score" is the English linguistic remnant of this ancient practical math.

The Etymological Origins of the Score

The word "score" originates from the Old Norse word skor, which literally translates to a notch, a tally, or an incision. It is also closely related to the Old English scoru. The transition from a physical mark on a piece of wood to a specific number is a fascinating journey through early European commerce and agriculture.

In medieval times, literacy and formal mathematics were not widespread among the working classes, such as shepherds, farmers, and innkeepers. To keep track of large quantities of items—most commonly livestock—these individuals used "tally sticks." A shepherd counting sheep would make a small notch in a stick for every animal that passed. When they reached the twentieth animal, they would make a larger, deeper cut or a distinctive "score" across the stick.

This physical "score" served as a visual anchor. Instead of remembering that they had 100 sheep, a shepherd would simply look at their stick and see five major scores. Over time, the word for the physical act of marking the stick became the word for the quantity itself. This is a common linguistic phenomenon where the tool or the action associated with a measurement eventually defines the measurement.

The Vigesimal System and Global Counting Traditions

The reason a score settled on the number 20 rather than 10 or 50 lies in the history of vigesimalism. While the decimal system eventually became the global standard due to its simplicity in written calculations, the base-20 system has appeared independently in cultures across the globe.

Pre-Decimal Europe

Before the standardization of the metric system and decimal currency, many European regions operated on vigesimal principles. In Old French, for example, the numbering system was heavily based on twenties. Traces of this remain in the modern French word for eighty, quatre-vingts, which literally means "four twenties." Similarly, the Celtic languages of Wales, Ireland, and Brittany used base-20 systems for centuries. English speakers adopted the term "score" during the period of Viking influence and integrated it into their own counting traditions.

The Mayan and Aztec Influence

Beyond Europe, the Mayans and Aztecs developed some of the most sophisticated vigesimal systems in human history. The Mayan calendar, famous for its precision, functioned on a base-20 logic. They viewed 20 as a "whole person" (ten fingers and ten toes). This cultural perspective illustrates that the concept of a "score" is not just an English quirk but a reflection of a nearly universal human way of perceiving quantity before the dominance of abstract, paper-based arithmetic.

Famous Historical Usages of the Score

The reason the average person today knows that a score is 20 years is largely due to its appearance in high-stakes historical and religious texts. The word carries a weight and solemnity that the simple number "twenty" does not.

Abraham Lincoln and the Gettysburg Address

The most famous use of the term in American history occurs in the opening line of Abraham Lincoln’s 1863 Gettysburg Address: "Four score and seven years ago..."

Lincoln was a master of the English language and chose his words for their biblical and traditional resonance. By saying "four score and seven" instead of "eighty-seven," he achieved several rhetorical goals:

1. Gravitas: The term "score" sounds ancient and foundational. It gave his speech a sense of historical continuity.
2. Biblical Echo: The phrasing mirrored the language of the King James Bible, with which his audience would have been intimately familiar.
3. Calculation: It forced the listener to pause and calculate the time, leading them back to 1776 (1863 minus 87), the year of the Declaration of Independence.

In this context, Lincoln used "four score" (4 x 20 = 80) plus seven to create a bridge between the bloodshed of the Civil War and the birth of the nation.

The Biblical Lifespan

Another primary source for the term’s longevity is the Bible, specifically Psalm 90:10. In many traditional translations, the verse reads: "The days of our years are threescore years and ten; and if by reason of strength they be fourscore years, yet is their strength labour and sorrow..."

This passage established the cultural expectation that a standard human lifespan was "three score and ten," or 70 years. If a person was particularly healthy, they might reach "four score," or 80 years. For centuries, this was the primary way English-speaking people conceptualized the duration of a human life. It framed life not as a series of individual years, but as a set of cycles.

Shakespearean Usage

William Shakespeare frequently employed the term "score" to denote both time and quantity. In Macbeth, characters refer to "three score and ten" to describe their memories and the span of time they have observed. Because Shakespeare’s works have been taught for hundreds of years, the term has remained in the collective consciousness of the English-speaking world long after its practical use in marketplaces ended.

Mathematical Breakdown and Conversions

To understand the scale of a score in a modern context, it is helpful to break the 20-year period down into smaller, more familiar units of time.

Calculating Multiple Scores

When reading historical documents, you may encounter various combinations of scores. Here is a quick reference for common calculations:

• Half a score: 10 years (equivalent to a decade).
• A score and a half: 30 years (often considered the length of a generation).
• Three score: 60 years.
• Five score: 100 years (equivalent to a century).
• A score of scores: 400 years.

Comparative Units: Score vs. Decade vs. Century

Why did the "decade" eventually replace the "score" in common parlance? The answer lies in the global shift toward the decimal system during the Enlightenment and the Industrial Revolution.

The Rise of the Decade

A decade is 10 years. As governments and financial institutions began to favor base-10 for everything from currency to the metric system, counting by tens became more intuitive. The decade is a "neat" number in a decimal world. In contrast, the score feels like a "round" number only in a vigesimal world.

The Longevity of the Century

The century (100 years) has remained the dominant macro-unit of time. Interestingly, 100 is both ten groups of ten (decimal) and five groups of twenty (vigesimal). Because 100 serves as a milestone in both systems, the century survived the transition from the era of "scores" to the era of "decades" without losing its cultural power.

Rhetorical Nuance

Today, we use these terms for different effects:

• Decade: Used for data, trends, and specific timeframes (e.g., "the last decade of economic growth").
• Score: Used for poetry, history, and to emphasize a long, burdensome, or momentous span of time (e.g., "scores of years have passed since the treaty").

The Evolution of the Word Score in Modern Language

While the use of "score" to mean 20 years has declined, the word itself has flourished in other areas of the English language. All these modern meanings trace back to the original Old Norse skor (the notch).

1. Sports and Games

When a player "scores" a goal, they are figuratively making a notch on a tally stick. In the early days of cricket and other folk games, the points were literally carved into wood. Today, a "score" is the numerical record of a contest, directly descended from the practice of counting by twenties.

2. Musical Scores

A musical "score" refers to the written notation of a composition. This usage began in the 1700s. The term was used because the staves (the horizontal lines) were "scored" or "etched" onto the paper, or because the bar lines "scored" the music into measures.

3. Legal and Social "Settling of Scores"

To "settle a score" means to pay a debt or get revenge. This comes from the practice of innkeepers "scoring" a customer’s drink tally on a slate or board. To settle the score was to pay the bill and have the marks erased.

4. Informal Quantity

In modern English, we often say "scores of people" to mean "a lot." In this context, it no longer means exactly 20, but rather "many groups of twenty," implying a number too large to count individually but not so large as to be "millions."

Why a Score is Exactly 20 Years

The precision of the 20-year definition is what allowed it to function as a legal and historical marker. In land deeds, royal decrees, and inheritance laws of the 15th and 16th centuries, "three score years" was a common way to denote the expiration of a lease or the duration of a life interest.

Because it was based on a physical counting method (the notch), there was no ambiguity. Everyone—from the illiterate laborer to the high court judge—understood that a score was twenty. In an era before standardized clocks and calendars were available to every citizen, these collective nouns (dozen, score, fortnight) provided the essential framework for organizing society.

Summary of the Score as a Time Unit

The score is a relic of a time when the human body and simple tools like the tally stick dictated how we measured the world. It represents 20 years, a duration that roughly corresponds to the time it takes for a child to reach adulthood or for a new generation to begin. Its persistence in our language—through the speeches of presidents and the verses of the Bible—ensures that we remain connected to a vigesimal past where history was marked by incisions on wood rather than pixels on a screen.

Frequently Asked Questions

How many years are in 4 score and 7?

There are 87 years in "four score and seven." This is calculated by multiplying 4 by 20 (which equals 80) and then adding 7.

Is a score used in science or physics?

No, the score is considered an archaic or literary unit. In scientific and technical fields, time is measured in SI units (seconds) or standard decimal-based calendar units (years, decades, centuries).

What is the difference between a score and a fortnight?

A score refers to a count of 20 (usually 20 years), while a fortnight refers to a specific period of 14 days (two weeks). Both are traditional English units of time, but they operate on different scales.

Why did Abraham Lincoln use the word score?

Lincoln used "score" to evoke the language of the King James Bible and to give his speech a formal, timeless quality. It was a rhetorical choice to make the founding of the United States seem like a hallowed, ancient event.

Does a score always mean 20 years?

A "score" always means 20 of something. If you have a "score of apples," you have 20 apples. It only means 20 years when the context of the sentence refers to time or age.

What is "three score and ten" in years?

"Three score and ten" is 70 years (3 x 20 + 10). It is famously known as the traditional "allotted" lifespan of a human being in biblical literature.