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"alliance" is also used as a crossword clue. If that's what you saw, the answer is often confederation (13 letters).
Definitions
the act of forming an alliance or confederation
Word origin
From Middle English alliaunce, from Old French aliance (French alliance). Equivalent to ally + -ance. Compare with Doric Greek ἁλία (halía, “assembly”). See also al-.
Used in a sentence
“matrimonial alliances”
“an alliance between church and state, or welded by two countries”
“And as for kindred , there is no Alliance neerer vnto any one, than their Countrey , that is to be vnto vs another God, and our prime and deareſt Parent.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Treaty group”8 letters
02“Partnership”8 letters
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