What is "Other Half" to You?

It is one part of an object equally divided into two. One part is called “half”, the other one is called “the other half”. An area of thirty minutes of a clock is called “half”. Michael Buble uses the “half” and “the other half” in Haven’t Met You Yet. A friend of mine on Facebook calls her husband “other half”, too. Without “the other half”, a “half” would be just a half; incomplete. As for me, the account named Anugerah Other Half shows that it is just fifty percent of me, where Anugerah Still Feels Guilty is “the first half”.