Glossary: education and reference

Terms that show up on the multiplication chart, author bibliography and word-reference pages, explained in a few sentences.

Public domain

A work whose copyright term has expired — commonly life plus 70 years after the author's death — and so can be freely copied and republished.

Bibliography

An organized list of an author's published works, usually with each one's publication year.

Synonym

A word with a meaning very close to another, though almost never identical — context decides which one fits.

Antonym

A word with the opposite meaning of another.

Prime number

A whole number greater than 1 that divides evenly only by 1 and itself.