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dominion: dominion: [15] Dominion, in common with demesne, domain, dominant, dominate, domineer, dominie, domino, and don, and indeed danger and dungeon, comes ultimately from Latin dominus ‘lord, master’. This was a derivative of Latin domus ‘house’ (source of English dome) and, like the parallel Greek formation despótēs (source of English despot), originally meant ‘master of the house’.

Its most direct descendant in modern English is don [17]. This is the Spanish reflex of Latin dominus, used as a title of respect for Spanish lords or gentlemen, and has been applied since the mid 17th century (originally as a piece of university slang) to university teachers. Of derivatives, dominion comes from Latin dominium ‘property’ (of which a post-classical descendant was dominiō or domniō, source of English dungeon); dominate [17] and dominant [15] come from the verb dominārī ‘be lord and master’; domineer [16] is also from dominārī, via French dominer and early modern Dutch domineren; and dominie [17], a Scottish term for a ‘schoolmaster’, probably comes from the Latin vocative case dominē.
=> dame, danger, demesne, despot, dome, domestic, dominate
opinion: opinion: [13] Opinion comes via Old French from Latin opīniō, a derivative of opīnārī ‘think’. It is not certain where this came from, although some have linked it with Latin optāre ‘choose’, source of English adopt [16], co-opt [17], opt [19], and option [17].
=> adopt, opt, option
pinion: pinion: see pin, pine
dominion (n.): early 15c., from Old French dominion "dominion, rule, power," from Medieval Latin dominionem (nominative dominio), corresponding to Latin dominium "property, ownership," from dominus (see domination).

British sovereign colonies often were called dominions, hence the Dominion of Canada, the formal title after the 1867 union, and Old Dominion, the popular name for the U.S. state of Virginia, first recorded 1778.
minion (n.): c. 1500, "a favorite; a darling; a low dependant; one who pleases rather than benefits" [Johnson], from Middle French mignon "a favorite, darling" (n.), also a term of (probably homosexual) abuse;" as an adjective, "dainty, pleasing, favorite," from Old French mignot "pretty, attractive, dainty, gracious, affectionate," perhaps of Celtic origin (compare Old Irish min "tender, soft"), or from Old High German minnja, minna "love, memory" (see mind (n.)). Used 16c.-17c. without disparaging overtones.
opinion (n.): c. 1300, from Old French opinion "opinion, view, judgements founded upon probabilities" (12c.), from Latin opinionem (nominative opinio) "opinion, conjecture, fancy, belief, what one thinks; appreciation, esteem," from stem of opinari "think, judge, suppose, opine," from PIE *op- (2) "to choose" (see option).
Where there is much desire to learn, there of necessity will be much arguing, much writing, many opinions; for opinion in good men is but knowledge in the making. [Milton, "Areopagitica"]
opinionate (v.): "to hold an opinion," c. 1600, from opinion + -ate (2); now surviving mostly in past participle adjective opinionated.
opinionated (adj.): "obstinate," c. 1600, past participle adjective from opinionate.
pinion (n.1): "wing joint, segment of a bird's wing," mid-15c., from Old French pignon "wing-feather, wing, pinion" (c. 1400), from Vulgar Latin *pinnionem (nominative *pinnio), augmentative of Latin pinna "wing" (see pin (n.)).
pinion (n.2): "small wheel with teeth to gear with a larger one" (as in rack and pinion), 1650s, from French pignon "pinion" (16c.), literally "gable," from Old French pignon "pointed gable, summit," from Vulgar Latin *pinnionem, augmentative of Latin pinna "battlement, pinnacle" (see pin (n.)).
pinion (v.): "disable by binding the arms," 1550s, older in English than literal sense "cut or bind the pinions (of a bird's wing) to prevent flying" (1570s); from pinion (n.1). Related: Pinioned.
opinionative: "Holding obstinately to one's own opinion; opinionated", Mid 16th cent.; earliest use found in Andrew Borde (c1490–1549), physician and author. From opinionate + -ive; compare -ative.
opinionable: "= opinable. Also as noun: an object of opinion", Late 15th cent.; earliest use found in George Ripley (d. c1490), alchemist and Augustinian canon. From opinion + -able.