word-forming element used in forming nouns from Latin words ending in -atus, -atum (e.g. estate, primate, senate). Those that came to English via Old and Middle French often arrived with -at, but an -e was added after c.1400 to indicate the long vowel.
The suffix also can mark adjectives, formed from Latin past participals in -atus, -ata (e.g. desolate, moderate, separate), again, they often were adopted in Middle English as -at, with an -e appended after c.1400.
verbal suffix for Latin verbs in -are, identical with -ate (1). Old English commonly made verbs from adjectives by adding a verbal ending to the word (e.g. gnornian "be sad, mourn," gnorn "sad, depressed"), but as the inflections wore off English words in late Old and early Middle English, there came to be no difference between the adjective and the verb in dry, empty, warm, etc. Thus accustomed to the identity of adjectival and verbal forms of a word, the English, when they began to expand their Latin-based vocabulary after c.1500, simply made verbs from Latin past-participial adjectives without changing their form (e.g. aggravate, substantiate) and it became the custom that Latin verbs were anglicized from their past participle stems.
in chemistry, word-forming element used to form the names of salts from acids in -ic; from Latin -atus, -atum, suffix used in forming adjectives and thence nouns; identical with -ate (1).
The substance formed, for example, by the action of acetic acid (vinegar) on lead was described in the 18th century as plumbum acetatum, i.e. acetated lead. Acetatum was then taken as a noun meaning "the acetated (product)," i.e. acetate. [W.E. Flood, "The Origins of Chemical Names," London, 1963]
A derivative of a specified chemical compound or element: aluminate.
A salt or ester of a specified acid whose name ends in -ic: acetate.
A suffix used to form the name of a salt or ester of an acid whose name ends in -ic, such as acetate, a salt or ester of acetic acid. Such salts or esters have one oxygen atom more than corresponding salts or esters with names ending in -ite. For example, a sulfate is a salt of sulfuric acid and contains the group SO4, while a sulfite contains SO3. Compare -ite.