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

The principal suite, meanwhile, is located in a separate annex and has its own outdoor shower. — Annabelle Dufraigne, Architectural Digest, 1 Sep. 2026

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

Verb

The government later annexed the portion of the city formerly controlled by Jordan and declared the entirety of Jerusalem as its national capital, a move still unrecognized by most countries. — Ilan Ben Zion, Christian Science Monitor, 14 Oct. 2026

If the project moves forward, the city would also need to seek approval from the Yolo County Local Agency Formation Commission, known as LAFCO, to annex the land. — Darrielle Fair, CBS News, 14 Oct. 2026