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1.
A long term girlfriend/boyfriend, or your wife/husband. So called because they are very special to you and it is as though they complete you.
Me and my other half went on a night boat trip in Paris last weekend, it was lovely and romantic...
by Atomik Spongeface July 07, 2008
 
2.
Other Half is what you call the person in your life that is so much like you and you spend a lot of time with.
Person 1: Why are you so distant?
Person 2: My Other Half isn't here
Person 1: I'm so Sorry:'(
by TheOriginal May 16, 2013
 
3.
Newest of new age garbage to grace western culture...a hip new way to simply say Girlfriend or Boyfriend. Other half is a term used by those whom destroy all of their own individuality and reinforce partner worship as if they would not be complete without them thus upon break up its impossible for them to survive alone.
Craig: Hey Dad this is my other half Susan!

Dad: Stop being a new age faggot and just say its your damn woman!

Craig: Dad relax were getting married but I am taking her last name because I respect her so much, shes my goddess who tells me how to live and breathe I would just die without her!!

Dad: I have no son...I have a daughter in a lesbien relationship
by Blakdynomite November 20, 2013