Exemplary
来自Big Physics
late 16th century: from late Latin exemplaris, from Latin exemplum ‘sample, imitation’ (see example).
wiktionary
From Middle French exemplaire(“exemplary; a copy, facsimile; an example; a sample, specimen”), from Latin exemplāris(“exemplary; a copy, facsimile”), from exemplum(“an example; a sample; a copy or transcript”). Doublet of exemplar.
etymonline
exemplary (adj.)
1580s, "fit to be an example," from French exemplaire, from Late Latin exemplaris "that serves as an example, pattern, or motto," from exemplum "example, pattern, model" (see example). Earlier (early 15c.) as a noun meaning "a model of conduct," from Late Latin exemplarium.