Etymology
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adjoin (v.)

c. 1300, "unite (something to something else), ally" (a sense now obsolete); late 14c. as "be contiguous with, be adjacent to," from Old French ajoin- stem of ajoindre "join together, unite," from Latin adiungere "fasten on, harness, join to," from ad "to" (see ad-) + iungere "to bind together" (from a nasalized form of PIE root *yeug- "to join"). The meaning "be contiguous with, be in contact with" is from late 14c. The French word was Latinized 16c. to Modern French adjoindre. Related: Adjoined; adjoining.

Origin and meaning of adjoin

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Definitions of adjoin

adjoin (v.)
lie adjacent to another or share a boundary;
Canada adjoins the U.S.
Synonyms: border / edge / abut / march / butt / butt against / butt on
adjoin (v.)
be in direct physical contact with; make contact;
Synonyms: touch / meet / contact
adjoin (v.)
attach or add;
I adjoin a copy of your my lawyer's letter
From wordnet.princeton.edu