| amnion | (noun) thin innermost membranous sac enclosing the developing embryo of higher vertebrates (reptiles, birds and mammals) | Synonyms: amnios, amniotic sac |
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| anion | (noun) a negatively charged ion | - |
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| bunion | (noun) a painful swelling of the bursa of the first joint of the big toe | - |
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| communion | (noun) sharing thoughts and feelings | Synonyms: sharing |
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| (noun) (Christianity) a group of Christians with a common religious faith who practice the same rites | - |
| companion | (noun) a friend who is frequently in the company of another | Synonyms: associate, comrade, familiar, fellow |
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| (noun) one paid to accompany or assist or live with another | - |
| (noun) a traveler who accompanies you | Synonyms: fellow traveler, fellow traveller |
| coronion | (noun) the craniometric point at the tip of the coronoid process of the mandible | - |
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| crinion | (noun) point where the hairline meets the midpoint of the forehead | Synonyms: trichion |
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| disunion | (noun) the termination or destruction of union | - |
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| dominion | (noun) a region marked off for administrative or other purposes | Synonyms: district, territorial dominion, territory |
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| (noun) dominance or power through legal authority | Synonyms: rule |
| fanion | (noun) a small flag used by surveyors or soldiers to mark a position | - |
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| gonion | (noun) the craniometric point on either side at the apex of the lower jaw | - |
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| inion | (noun) the craniometric point that is the most prominent point at the back of the head (at the occipital protuberance) | - |
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| intercommunion | (noun) participation in Holy Communion by members of more than one church (eg Catholic and Orthodox) | - |
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| minion | (noun) a servile or fawning dependant | - |
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| onion | (noun) an aromatic flavorful vegetable | - |
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| (noun) bulbous plant having hollow leaves cultivated worldwide for its rounded edible bulb | Synonyms: Allium cepa, onion plant |
| (noun) the bulb of an onion plant | - |
| opinion | (noun) the reason for a court's judgment (as opposed to the decision itself) | Synonyms: ruling |
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| (noun) a personal belief or judgment that is not founded on proof or certainty | Synonyms: persuasion, sentiment, thought, view |
| (noun) a belief or sentiment shared by most people; the voice of the people | Synonyms: popular opinion, public opinion, vox populi |
| (noun) a vague idea in which some confidence is placed | Synonyms: belief, feeling, impression, notion |
| (noun) the legal document stating the reasons for a judicial decision | Synonyms: judgement, judgment, legal opinion |
| (noun) a message expressing a belief about something; the expression of a belief that is held with confidence but not substantiated by positive knowledge or proof | Synonyms: view |
| pinion | (noun) wing of a bird | Synonyms: pennon |
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| (noun) any of the larger wing or tail feathers of a bird | Synonyms: flight feather, quill, quill feather |
| (noun) a gear with a small number of teeth designed to mesh with a larger wheel or rack | - |
| pogonion | (noun) the craniometric point that is the most forward-projecting point on the anterior surface of the chin | - |
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| quaternion | (noun) the cardinal number that is the sum of three and one | Synonyms: 4, four, foursome, IV, Little Joe, quadruplet, quartet, quatern, quaternary, quaternity, tetrad |
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| reunion | (noun) the act of coming together again | Synonyms: reunification |
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| (noun) a party of former associates who have come together again | - |
| rhinion | (noun) the anterior tip at the end of the suture of the nasal bones | - |
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| sphenion | (noun) the anterior tip of the parietal bone | - |
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| stephanion | (noun) the craniometric point on the coronal suture above the acoustic meatus | - |
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| ternion | (noun) the cardinal number that is the sum of one and one and one | Synonyms: 3, deuce-ace, III, leash, tercet, ternary, terzetto, three, threesome, tierce, trey, triad, trine, trinity, trio, triplet, troika |
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| union | (noun) the act of making or becoming a single unit | Synonyms: conjugation, jointure, unification, uniting |
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| (noun) the act of pairing a male and female for reproductive purposes | Synonyms: conjugation, coupling, mating, pairing, sexual union |
| (noun) a device on a national flag emblematic of the union of two or more sovereignties (typically in the upper inner corner) | - |
| (noun) the occurrence of a uniting of separate parts | - |
| (noun) an organization of employees formed to bargain with the employer | Synonyms: brotherhood, labor union, trade union, trades union |
| (noun) a political unit formed from previously independent people or organizations | - |
| (noun) a set containing all and only the members of two or more given sets | Synonyms: join, sum |
| (noun) healing process involving the growing together of the edges of a wound or the growing together of broken bones | Synonyms: conglutination |
| (noun) the state of being joined or united or linked | Synonyms: unification |
| (noun) the state of being a married couple voluntarily joined for life (or until divorce) | Synonyms: marriage, matrimony, spousal relationship, wedlock |