接合 (せつごう)union; joining; conjugation

union; joiningnoun (common) (futsuumeishi), noun or participle which takes the aux. verb suru
conjugationnoun (common) (futsuumeishi), noun or participle which takes the aux. verb suru

接合, its kanji, and other words that share them.Open this graph

Kanji in 接合

直接ちょくせつdirect; immediate
接触せっしょくtouch; contact
面接めんせつinterview (e.g. for a job)
密接みっせつclose (relationship, connection, etc.); intimate
接戦せっせんclose combat; close contest
接近せっきんgetting closer; drawing nearer
接するせっするto touch; to come in contact with
接待せったいentertainment (of guests; esp. in the corporate world); treating (to food and drinks)
合意ごうい(coming to an) agreement; consent
問い合わせといあわせenquiry; inquiry
総合そうごうsynthesis; coordination
試合しあいmatch; game
連合れんごうunion; alliance
会合かいごうmeeting; assembly
組合くみあいassociation; union
統合とうごうintegration; unification

See how 接合 connects to the rest of Japanese.