Main Entry: ad·join

Pronunciation: \ə-ˈjȯin, a-\

Function: verb

Etymology: Middle English, from Anglo-French ajoindre, from Latin adjungere, from ad- + jungere to join — more at yoke

Date: 14th century

transitive verb 1 : to add or attach by joining
2 : to lie next to or in contact withintransitive verb : to be close to or in contact with one another