LATIN DICTIONARYLexicon Latīnum
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“period” in Latin

The English word period itself goes back to Latin periodus.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

period
Space of time, spatium temporis; tempus, (plur.) tempora; aetas (age): tempestas (a space of time with its characteristic distinctions, a period marked by its history): ☞ aera in this sense is very low Latin; periodus is without authority: no period of my life, nullum aetatis meae tempus.
End, Vid:
Sentence, orbis orationis or verborum; circuitus orationis; verborum circuitus, complexio, ambitus, comprehensio; (The words are found in this connection and order.) comprehensio et ambitus verborum; verborum continuatio, constructio; conversio orationis (Cic.), or simply, ambitus, circuitus, comprehensio, circumscriptio, continuatio (Vid: Cic., Brut., 44, 162; id. Or., 61, 204; ☞ periodus in this sense is not strictly a Latin word; Cic. gives ambitus, circuitio, etc., adding once quem Graeci περίοδον, etc. in Greek characters, once si sic periodum appellari placet; and so Quint., Inst., 9, 4, 14; but it has been commonly employed in this sense by modern writers; and sometimes, for perspicuity, it may be necessary to adopt it): well-constructed periods, arguti, certique et circumscripti verborum ambitus (Cic., Or., 12, 138): a complete period, comprehensio plena (ib.): a short period, brevis comprehensio et ambitus verborum (Cic., Brut., 44, 162): too long a period, nimis longa sententiarum continuatio (Cic., De Or., 3, 13, 49): avoid long periods, fugere oportet longam verborum continuationem (Auct., ad Her., 4, 12, 18): a neat and well-rounded period, apta et quasi rotunda verborum constructio (Cic., Brut., 78, 272); forma concinnitasque verborum facit orbem suum (Cic., Or., 44, 149; the period is well rounded).

Quick answer

What is the Latin word for period?
The usual Latin words for “period” are tempus, aetās, tempestās; also periodus, verbum, complexiō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.