IPA: /koʊəˈnɛks/
KK: /koˈænɛks/
To join or attach something to another thing, especially in a formal or legal way.
The government decided to coannex the new territory to the existing state.
Past: coannexed
Past Participle: coannexed
Coannex → It is formed from "co-" (meaning together) and "annex" (from Latin "annexare", meaning to tie or fasten). The word "coannex" means to tie or fasten together with something else.
Think of 'together' ('co-') and 'tying' ('annex') to remember that 'coannex' means to connect or fasten things together.