LATIN DICTIONARYLexicon Latīnum
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“within” in Latin

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

within
preposition, intra (within a space or time): inter (during a time, refers only to time past, time which elapsed while anything happened, not the point from and to which, which is denoted by intra, withinand still before the expiration of a period; both followed by an accusative); in with an ablative (in a time, chiefly of shorter periods, and when no numeral is connected with the time; e.g., within an hour, in hora; within a year, in anno; for which we find, also, anno vertente, in the course of the year; Vid: Schütz. Lex. Civ. in v. Vertens).
within adv.
intus (toward the interior): interius (in the midst or interior; opposed to exterius): intrinsecus (toward the inner part, on the inner side; opposed to extrinsecus, exterius); ex interiore parte; ab interioribus partibus (from within; opposed to extrinsecus, ab exterioribus partibus): ☞ intra and intro, in this sense, are not classical.

Quick answer

What is the Latin word for within?
The usual Latin words for “within” are intrā, inter, intus; also intrīnsecus, extrā. 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.