1781, coined by Jeremy Bentham (1748-1832) from utility + -arian on the model of + unitarian, etc. One guided by the doctrine of the greatest happiness for the greatest number. From 1802 as an adjective; in the general sense "having regard to utility rather than beauty," from 1847.

[Bentham] had a phrase, expressive of the view he took of all moral speculations to which his method had not been applied, or (which he considered as the same thing) not founded on a recognition of utility as the moral standard ; this phrase was "vague generalities." Whatever presented itself to him in such a shape, he dismissed as unworthy of notice, or dwelt upon only to denounce as absurd. He did not heed, or rather the nature of his mind prevented it from occurring to him, that these generalities contained the whole unanalyzed experience of the human race. [John Stuart Mill, "The Works of Jeremy Bentham," London and Westminster Review, August 1838]

1794, from French utiliser, from Italian utilizzare, from utile "usable," from Latin utilis "usable," from uti "make use of, profit by, take advantage of" (see use (v.)).

Utilize is fast antiquating improve, in the sense of 'turn to account.' [Fitzedward Hall, "Modern English," 1873]

1551, from Modern Latin Utopia, literally "nowhere," coined by Thomas More (and used as title of his book, 1516, about an imaginary island enjoying the utmost perfection in legal, social, and political systems), from Greek ou "not" + topos "place" (see topos). The current (since c. 1960) explanation of Greek ou "not" is an odd one, as it derives the word from the PIE root *aiw- "vital force, life; long life, eternity." Linguists presume a pre-Greek phrase *(ne) hoiu (kwid) "(not on your) life," with ne "not" + *kwid, an "emphasizing particle" [Watkins]. The same pattern is found elsewhere.

Extended to any perfect place by 1610s. Commonly, but incorrectly, taken as from Greek eu- "good" (see eu-) an error reinforced by the introduction of dystopia (by 1844). On the same model, Bentham had cacotopia (1818).