What is another word for "period"?

Roget's Thesaurus (1911) lists these synonyms for "period": abra, absence, abysm, abyss, academical, after, afterwards, antithesis, artistic, barranca, between, breach, breachy, break, caesura, canon, chap, chasm, chaste, chink, classical, classicalism, classicism, cleft, close, clove, come, concinnity, correct, crack, cranny, creek, crevasse, crevice, cut, date, defile, degree, dike, ease.