What is the Latin word for third?

The usual Latin words for “third” are tertius, tertiānus. The right choice depends on the sense; see the distinctions below.

English → Latin

“third” in Latin

tertiusthird tertiānusbelonging to the third

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

third

tertius: Every third, tertius quisque; e.g., every third month, tertio quoque mense: for the third time, tertium: for the second and third time, iterum ac tertium; iterum tertiumque: that comes on every third day, tertianus (as an ague, etc.): the third part, teniae (with or without partes): a third (= another), tertius.

Quick answer

What is the Latin word for third?: The usual Latin words for “third” are tertius, tertiānus. 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.