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Supplementation Partner 

A sexual partner outside of your primary relationship in which the partner "supplements" what your main relationship is lacking in. The term is used as a less crass version of "fuck buddies" or "friends with benefits."
"My husband won't go down on me, but my supplementation partner sure does."

Supplementaration 

The supplementaration of water allowed him to get a high.
Supplementaration by DannyWB October 13, 2005