From Bartleby.com:
ETYMOLOGY:
Middle English morgage, from Old French : mort, dead (from Vulgar Latin *mortus, from Latin mortuus, past participle of mor, to die; (see mer- in Appendix I) +...
I think you want the prefixes for numers.
uni- means "one" as in the word unicorn which has one horn and the word unique which means one of a kind.
bi- means two, as in a bicycle having two...