<p><strong>Verb (used with object):</strong></p><ul><li>to bring in contact, connect, or bring or put together:<ul><li>to join hands;</li><li>to join pages with a staple.</li></ul></li><li>to come into contact or union with:<ul><li>The brook joins the river.</li></ul></li><li>to bring together in a particular relation or for a specific purpose, action, etc.; unite:<ul><li>to join forces against the smugglers.</li></ul></li><li>to become a member of (an organization, party, etc.):<ul><li>to join a club.</li></ul></li><li>to enlist in (one of the armed forces):<ul><li>to join the Navy.</li></ul></li><li>to come into the company of; meet or accompany:<ul><li>I'll join you later.</li></ul></li><li>to participate with (someone) in some act or activity:<ul><li>My wife joins me in thanking you for the gift.</li></ul></li><li>to unite in marriage.</li><li>to meet or engage in (battle, conflict, etc.):<ul><li>The opposing armies joined battle.</li></ul></li><li>to adjoin; meet:<ul><li>His land joins mine.</li></ul></li><li>to draw a curve or straight line between:<ul><li>to join two points on a graph.</li></ul></li></ul><p><strong>Verb (used without object):</strong></p><ul><li>to come into or be in contact or connection:<ul><li>a place where cliffs and sea join.</li></ul></li><li>to become united, associated, or combined; associate or ally oneself; participate (usually followed by with):<ul><li>Please join with us in our campaign.</li></ul></li><li>to take part with others (often followed by in):<ul><li>Let's all join in.</li></ul></li><li>to be contiguous or close; lie or come together; form a junction:<ul><li>Our farms join along the river.</li></ul></li><li>to enlist in one of the armed forces (often followed by up):<ul><li>He joined up to fight for his country.</li></ul></li><li>to meet in battle or conflict.</li></ul><p><strong>Noun:</strong></p><ul><li>a joining.</li><li>a place or line of joining; seam.</li><li>Mathematics: union (def 10a).</li></ul>