confectionery (n.)

mid-14c., confescioun, confeccioun, "anything prepared by mixing ingredients," from Old French confeccion (12c., Modern French confection) "drawing up (of a treaty, etc.); article, product," in pharmacology, "mixture, compound," from Medieval Latin confectionem (nominative confectio) "a preparation, a medicament," in classical Latin, "a making, a preparing," noun of action from past-participle stem of conficere "to prepare," from assimilated form of com "with" (see con-) + combining form of facere "to make, to do" (from PIE root *dhe- "to set, put").

From early 15c. as "the making by means of ingredients, art or act of compounding different substances into one preparation." In late 14c. also "something prepared or made with sugar or syrup;" sense of "candies, bonbons, light pastry" predominated from 16c.

word-forming element making nouns meaning "place for, art of, condition of, quantity of," from Middle English -erie, from Latin -arius (see -ary). Also sometimes in modern colloquial use "the collectivity of" or "an example of."