late 14c., "tangible thing, something perceived with or presented to the senses," from Old French object and directly from Medieval Latin obiectum "thing put before" (the mind or sight), noun use of neuter of Latin obiectus "lying before, opposite" (as a noun in classical Latin, "charges, accusations"), past participle of obicere "to present, oppose, cast in the way of," from ob "in front of, towards, against" (see ob-) + iacere "to throw" (from PIE root *ye- "to throw, impel").
Sense of "purpose, thing aimed at" is from early 15c., from Latin obiectus "that which presents itself to the sight." Meaning "that toward which a cognitive act is directed" is from 1580s. Grammatical sense of "a member of a sentence expressing that on which the action of the verb is exerted" is from 1729.
No object "not a thing regarded as important" is from 1782, in which the sense of object is "obstacle, hindrance" (c. 1500). As an adjective, "presented to the senses," from late 14c. Object-lesson "instruction conveyed by examination of a material object" is from 1831.
"act or process of making or presenting (someone or something) as an object, especially an object of sense," by 1860, noun of action from objectify.
late 14c., objeccioun, "argument against the validity of a proposition or line of reasoning," from Old French objeccion "reply, retort" (12c.) and directly from Late Latin obiectionem (nominative obiectio), "a throwing or putting before" (in Medieval Latin "an objection"), noun of action from past-participle stem of Latin obicere "to oppose" (see object (n.)).