Learner's definition of UNITE
to join together to do or achieve something
Party members united in support of their candidate.
Students united to protest the tuition increase.
uniting against a common enemy
— often used as (be) united
to cause (two or more people or things) to be joined together and become one thing
A treaty united the independent nations.
They were united in marriage [=they were married] on Sunday, August 24.
to become joined together as one thing