Alliance
Middle English: from Old French aliance, from alier ‘to ally’ (see ally1).
wiktionary
From Middle English alliaunce, from Old French aliance (French: alliance). Equivalent to ally + -ance. Compare with Doric Greek ἁλία (halía, "assembly").
etymonline
alliance (n.)
c. 1300, "bond of marriage" (between ruling houses or noble families), from Old French aliance (12c., Modern French alliance) "alliance, bond; marriage, union," from aliier (Modern French allier) "combine, unite" (see ally (v.)).
General sense of "combination for a common object" is from mid-14c., as are those of "bond or treaty between rulers or nations, contracted by treaty" and "aggregate of persons allied." Unlike its synonyms, "rarely used of a combination for evil" [Century Dictionary]. Meaning "state of being allied or connected" is from 1670s. The Latin word was alligantia.
