Becoming one is a concept that has been around for centuries and is often associated with marriage, but it can also refer to other types of unions. The crossword solutions for the term 'become one' include UNITE, MARRY, MERGE, WED, UNIFY, and JOIN. UNITE and UNIFY both refer to joining two or more entities together, while MARRY and WED are terms used to describe the union of two people in a romantic relationship. MERGE and JOIN are similar in that they both refer to combining two or more entities into one.