Pronunciation: ( join),[key] —v.t. 1. to bring in contact, connect, or bring or put together: to join hands; to join pages with a staple. 2. to come into contact or union with: The brook joins the river. 3. to bring together in a particular relation or for a specific purpose, action, etc.; unite: to join forces against the smugglers. 4. to become a member of (an organization, party, etc.): to join a club. 5. to enlist in (one of the armed forces): to join the Navy. 6. to come into the company of; meet or accompany: I'll join you later. 7. to participate with (someone) in some act or activity: My wife joins me in thanking you for the gift. 8. to unite in marriage.
9. to meet or engage in (battle, conflict, etc.): The opposing armies joined battle. 10. to adjoin; meet: His land joins mine. 11. to draw a curve or straight line between: to join two points on a graph.
—v.i. 1. to come into or be in contact or connection: a place where cliffs and sea join. 2. to become united, associated, or combined; associate or ally oneself; participate (usually fol. by with): Please join with us in our campaign. 3. to take part with others (often fol. by in): Let's all join in. 4. to be contiguous or close; lie or come together; form a junction: Our farms join along the river. 5. to enlist in one of the armed forces (often fol. by up): He joined up to fight for his country. 6. to meet in battle or conflict.
—n. 1. a joining.
2. a place or line of joining; seam.
3. Math.union (def. 10a).