soulmate

Etymology

soul + mate. First attested as soul-mate in a 1822 letter by Samuel Taylor Coleridge. Not in common usage before the 1980s.

noun

1. Someone, especially a romantic partner, with whom one is exceptionally or uniquely compatible or has a special, almost spiritual connection.
   Finding your wonderful soulmate is very similar to the process of sowing a seed and nurturing it into a beautiful blossoming plant. 2012, Ulli Springett, Tara Springett, Soulmate Relationships: How to find, keep and understand your perfect partner, Hachette UK
   I'm all over the place, I can't sit in one place / I'm not ashamed at all / Still findin' myself, let alone a soulmate, I'm just sayin' 2015, “Jungle”, in If You’re Reading This It’s Too Late, performed by Drake