-ate

First attested in the 15th century; borrowed from Latin -ātus, the perfect passive participle ending of first conjugation verbs, also used to form participial adjectives from nouns. Before -ate was introduced as a suffix in Middle English, Latin-borrowed participial adjectives were written with final -at (Middle English desolat for modern desolate) and could also be used as past participles (see degenerate or communicate for remnants of it) with or without a corresponding verb ending in -aten; see Etymology 2. Doublet of -ee and, distantly, of -ed.

See Etymology 1. In Middle English, verbs were derived from Latin-borrowed participial adjectives (also used as their past participles) and formed their infinitives in -aten (see -en; Middle English desolaten for modern desolate). In the 15th century, the loss of most verbal morphology made verbs formally identical to adjectives. This led to the heteronymy of Middle English verbs in -aten with their corresponding past participles, numerous adjectives in -ate being used as verbs, and, in the late 16th century, the systematic borrowing of such Latin participles as English verbs. The sheer number of newly borrowed verbs from Latin ending in -ate later gave rise to -ate's productivity as a verbal suffix. further etymology The same process also led to the systematic borrowing of Latin perfect passive participle of other kinds as English verbs. See dissect, delete, erase, applause (when older applaud) and exhaust: all borrowed from Latin participial stems of diverse conjugation groups. Compare also Basque -tu for similar development.

From the substantivization of perfect passive participles of first conjugation Latin verbs; see Etymology 1. Partly taken from French animate substantives that began to be Latinized during the 14th century: see French avoué and its re-Latinized version avocat, whence English advocate which underwent further re-Latinization. Partly from inanimate substantives taken from neuter forms of Latin participles: see mandate. French -é (e.g., avoué, employé) later gave English -ee.

From the substantivization of perfect passive participle from first conjugation Latin verbs; see Etymology 1. Used so to denote a product having been subjected to the said chemical and thus derived by it (e.g., plumbum acētātum (“acetated lead”) → acetate (“an acetated product; a salt or ester of acetic acid”)).

From the Latin abstract-noun-forming suffix -ātus, -ātūs.