to bring in contact, connect, or bring or put together

to join hands; to join pages with a staple.

to come into contact or union with

The brook joins the river.

to bring together in a particular relation or for a specific purpose, action, etc.; unite

to join forces against the smugglers.

to become a member of (an organization, party, etc.)

to join a club.

to enlist in (one of the armed forces)

to join the Navy.

to come into the company of; meet or accompany

I'll join you later.

to participate with (someone) in some act or activity

My wife joins me in thanking you for the gift.

to unite in marriage.

to meet or engage in (battle, conflict, etc.)

The opposing armies joined battle.

to adjoin; meet

His land joins mine.

to draw a curve or straight line between

to join two points on a graph.

to come into or be in contact or connection

a place where cliffs and sea join.

to become united, associated, or combined; associate or ally oneself; participate (usually fol. by with )

Please join with us in our campaign.

to take part with others (often fol. by in )

Let's all join in.

to be contiguous or close; lie or come together; form a junction

Our farms join along the river.

to enlist in one of the armed forces (often fol. by up )

He joined up to fight for his country.

to meet in battle or conflict.

a joining.

a place or line of joining; seam.

Mathematics . union ( def. 10a ) .

verb

disjoin , divide , separate , leave , resign , withdraw

verb

accompany , add , adhere , affix , agglutinate , annex , append , assemble , associate , attach , blend , bracket , cement , clamp , clasp , clip , coadunate , coalesce , combine , compound , concrete , conjoin , conjugate , connect , copulate , couple , entwine , fasten , fuse , grapple , hitch on , incorporate , interlace , intermix , juxtapose , knit , leash , link , lock , lump together , marry , mate , melt , mix , pair , put together , slap on , span , splice , stick together , tack on , tag on , tie , tie up , touch , weave , wed , weld , yoke , align , associate with , be in , come aboard , consort , cooperate , enlist , enroll , enter , fall in with , follow , go to , mingle with , pair with , plug into , side with , sign on , sign up , take part in , take up with , team up with , throw in with , tie up with , abut , adjoin , be adjacent to , be at hand , be close to , be contiguous to , bound , butt , communicate , extend , fringe , hem , lie beside , lie near , lie next to , line , march , meet , neighbor , open into , parallel , reach , rim , skirt , trench on , verge on , border , verge , consolidate , meld , unify , unite , affiliate , ally , bind , relate , muster in , amalgamate , bond , bridge , cantle , engage , glue , interlock , knee , knot , merge , mingle , participate , piece , pool , solder , stitch , suture , team , volunteer