1175-1225;Middle English < Late Latinintentus an aim, purpose, Latin: a stretching out (inten(dere) to intend + -tus suffix of v. action); replacing Middle Englishentent(e) < Old French < Late Latin, as above
Word Origin and History for to all intents and purposes
"purpose," early 13c., from O.Fr. entente, from L.L. intentus "attention," from L. intentus (fem. intentia), pp. of intendere "stretch out, lean toward, strain," lit. "stretched out" (see intend). Intentionally "on purpose" is from 1660s.
"very attentive," 1606, from L. intentus "attentive, eager, strained," pp. of intendere "to strain, stretch" (see intend).
Idioms and Phrases with to all intents and purposes
for all intents and purposes;
for all practical purposes. In every practical sense, virtually. For example, For all intents and purposes the case is closed, or For all practical purposes the Vice-President is the chief executive while the President is in the hospital. The first phrase, dating from the 1500s, originated in English law, where it was to all intents, constructions, and purposes. A shorter synonym is in effect, def. 1.