marry in

Short definition from Wiktionary

Verb

1. 1
   To join a family or group through marriage.
2. 2
   To marry someone of the same religious or ethnic group.

Noun

1. 1
   A person who is on a family tree because he has married someone on the tree, and is not related by blood to anyone on the tree except his own descendants.
2. 2
   A protest where many people marry, as in protest of a law that forbids such marriages.