Definitions of soulmates
Classical – Greek mythology – Originally humans were combined of 4 arms, 4 legs, and a single head made of 2 faces, but Zeus feared their power and split them all in half, condemning them to spending their lives searching for the other half to complete them. This theory was presented as a half-serious story by Aristophanes in Plato's Symposium, after all the participants at the Symposium ("drinking party") were charged to philosophize on the topic of love.
Spiritual and religious – concepts of reincarnation and karma. Soulmates have spent many previous lifetimes together.
Companion soulmate – People with whom one has made a connection
Twin soulmates – Very close friends with whom one has strong bonds.
Twin flame soulmate – A popular romantic belief that there is only one true soulmate.
Scientific soulmate – (If) a relationship can be quantified, and scored according to an internal happiness scale. A scientific soulmate is the person with whom you are the absolute happiest. You would therefore be less happy with any other person in existence.
Balance Partners and Messengers – The people you meet along the way who help you create balance in your life.
Divine Complement – A new colloquialism for a 'match made in heaven', a twin soul, who holds inborn potentials that match and complement one's own and and who is linked eternally through a signature in the heart at the dimension of the spirit.
- from
http://en.wikipedia.org/wiki/Soulmate
An interesting concept. It is almost metaphysics.