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

It is currently used as an annex for the DOC Training Academy and a wellness center for Correction staff. — Colin Mixson, New York Daily News, 15 Aug. 2026

In an attempt to get around the ruling regarding the facility’s closure, the board voted to close only the main building, leaving a nearby annex known as the Reach open with limited programming. — News Desk, Artforum, 14 Aug. 2026

Verb

This city was established in 2025 and is now asking its residents to consider annexing around 7,100 acres of surrounding land, including state and private property. — August 17, NPR, 17 Aug. 2026

Taiwan is no stranger to cyberattacks, particularly from neighboring China, which claims the East Asian democracy as its own and has vowed to annex it, by force if necessary. — John Liu, CNN Money, 13 Aug. 2026