Simple Definition:

A soulmate is a person with whom one has a deep and natural affinity, love, and understanding. This relationship is believed to be predestined and spiritual. [Affinity: a natural liking or feeling of connection; Predestined: determined or decided beforehand]

For example, a couple who have been together for decades and continue to understand each other’s needs and emotions on a deep level can be considered soulmates.

Very Simple Definition:

A soulmate is someone who you truly love and who understands you very well.

For example, a best friend who always listens and supports you could be your soulmate.