ラテン語のtardus、遅い、語源的にはretardから。
This word, not much used in English prose, is constantly employed in the U.S. and in Canada with reference to lateness in school-attendance. [Thornton, "American Glossary," 1912]Related: Tardily; tardiness. Earlier form of the word in English was tardif, tardyve (late 15c.). Tardity "slowness of movement or action" is recorded in English from early 15c., from Old French tardete, from Latin tarditas.