co·part·ner 
(kō-pärtnər, kōpärt′-)
(kō-pärtnər, kōpärt′-)n.
A joint partner, as in a business enterprise; an associate.
co·partner·ship′ n.
- interjectionally
- interjector
- interjectory
- interlace
- interlacement
- Interlaken
- interlaminate
- interlamination
- interlanguage
- interlard
- interleaf
- interleague
- interleave
- interleukin
- interleukin-1
- interleukin-2
- interleukin-3
- interlibrary
- interline
- interline
- interlinear
- interlineation
- Interlingua
- interlingual
- interlingually