join

Be or become joined or united or linked.

“Our paths joined”

Become part of; become a member of a group or organization.

“He joined the Communist Party as a young man”

Make contact or come together.

“The two roads join here”

Cause to become joined or linked.

“join these two parts so that they fit together”

A set containing all and only the members of two or more given sets.

The shape or manner in which things come together and a connection is made.