Etymology
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relationship (n.)

1640s, "sense or state of being related" by kindred, affinity, or other alliance, from relation + -ship. Specifically of romantic or sexual intimacy by 1944.

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interrelationship (n.)

also inter-relationship, "state of being interrelated," 1841, from inter- "between" + relationship.

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kinship (n.)

by 1764, from kin + -ship. Relationship covers the same sense but is a hybrid.

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gesellschaft (n.)

1887, "social relationship based on duty to society or an organization," from German Gesellschaft, from geselle "companion" + -schaft "-ship."

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unrelated (adj.)

1660s, "not akin," from un- (1) "not" + past participle of relate (v.). Meaning "not in any relationship" is attested from 1660s; that of "not told" is from 1764.

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beldam (n.)

also beldame, "aged woman," 1570s; earlier "grandmother" (mid-15c.), from dame (q.v.) in the sense of "mother" + bel-, Middle English prefix expressing relationship (as in belfader, belsire "grandfather"), from Old French bel, belle "beautiful, fair, fine" (see belle). This "direct relationship" sense of bel is not found in French, where the prefix, however, is used to form words for in-laws.

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affinity (n.)

c. 1300, "relation by marriage" (as opposed to consanguinity), from Old French afinite "relationship, kinship; neighborhood, vicinity" (12c., Modern French affinité), from Latin affinitatem (nominative affinitas) "relationship by marriage; neighborhood," noun of state from affinis "adjoining, adjacent," also "kin by marriage," literally "bordering on," from ad "to" (see ad-) + finis "a border, a boundary" (see finish (v.)).

The spelling was re-Latinized in early Modern English. It has been used figuratively in English since c. 1600 of structural relationships in chemistry, philology, geometry, etc. The meaning "natural liking or attraction, a relationship as close as family between persons not related by blood" is from 1610s.

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clingy (adj.)

1680s, of things, "apt to cling, adhesive," from cling + -y (2). Of persons (especially children) from 1969, though the image of a "clingy vine" in a relationship goes back to 1896. Related: Clinginess.

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coevolution (n.)

also co-evolution, 1965, from co- + evolution; supposedly introduced by Paul Ehrlich and Peter Raven in a study of the relationship between caterpillars and plants.

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Sabine (adj.)

"pertaining to the Sabines," a people dwelling in the central Apennines of ancient Italy, late 14c., from Latin Sabinus (in poetic Latin often Sabellus), perhaps literally "of its own kind" and connected to root of Sanskrit sabha "gathering of village community," Russian sebr "neighbor, friend," Gothic sibja, Old High German sippa "blood-relationship, peace, alliance," Old English sibb "relationship; peace;" see sibling). The Roman colonists traditionally took their wives by force from the Sabines (Rape of the Sabine Women).

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