Synonyms of annex in English:

annex


See definition of annex

verb

1‘the first ten amendments were annexed to the constitution in 1791’

SYNONYMS
add, append, attach, join
informal tack on, tag on

2‘Charlemagne annexed northern Italy, Saxony, and Bavaria’

SYNONYMS
take over, take possession of, appropriate, expropriate, arrogate, seize, conquer, occupy, garrison
usurp
ANTONYMS

relinquish


noun

1‘a school annex’

SYNONYMS
extension, supplementary building, addition, annexe
wing
North American informal ell