Synonyms of annex

annex 1 of 2

noun

ˈa-ˌneks 

as in addition

a smaller structure added to a main building

a new annex that will serve as the permanent home for the school library

Synonyms & Similar Words

• addition
• extension
• penthouse
• wing
• ell
• arm

annex

2 of 2

verb

ə-ˈneks 

as in to add

to join (something) to a mass, quantity, or number so as to bring about an overall increase

plans to annex the supply room so as to make the classroom bigger

Synonyms & Similar Words

• add
• adjoin
• append
• tack (on)
• expand
• introduce
• subjoin
• attach
• insert
• affix
• augment
• compound
• increase
• tie
• extend
• supplement
• enlarge
• inject
• tag
• complement
• infuse
• supply
• escalate
• enforce
• enhance
• graft
• reinforce
• prolong
• amplify
• multiply
• intensify
• fasten
• hitch
• swell (up)
• lengthen
• fix
• elongate
• boost
• aggrandize
• beef (up)
• interfuse
• heighten
• protract
• maximize
• strengthen
• raise
• magnify

Antonyms & Near Antonyms

• separate
• remove
• deduct
• subtract
• take off
• abate
• detach
• cut
• disconnect
• reduce
• knock off
• contract
• excise
• lower
• sever
• bate
• decrease
• diminish
• amputate
• lessen
• curtail
• abridge
• unfasten
• shorten
• disjoin
• cut back
• lop (off)
• abbreviate
• compress
• condense
• constrict
• retrench

Example Sentences

Recent Examples of annex

Noun

This book’s story The book — about 2 feet by 2 feet — was found by Nancy and John Flannery of Wheaton, as Nancy Flannery was taking inventory of Wheaton Historic Preservation Council items stored in the basement of an annex at Wheaton’s city hall. — Susan Sarkauskas, Chicago Tribune, 24 Aug. 2026

Plantation Middle School, repurposed as district offices housing staff from the TSCC and TSCC annex buildings. — Sarah Perkel, USA Today, 19 Aug. 2026

Verb

The project developer had sought to annex the property to the city but withdrew its application earlier this month. — Alisha Ebrahimji, CNN Money, 26 Sep. 2026

Voting also was held in Crimea, which was illegally annexed by Russia in 2014. — ABC News, 23 Sep. 2026