In modern physics, antimatter is defined as matter composed of the antiparticles (or "partners") of the corresponding particles in "ordinary" matter, and can be thought of as matter with reversed charge, parity, and time (CPT reversal). wikipedia 
of the Communication Processes
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Partner | ˈpartnɐ | masculine noun Gen. Partners Pl. Partner partner (Bündnispartner) ally (im Film/Theater) co-star ▶ Fem. Partnerin partner | BrE ˈpɑːtnə, AmE ˈpɑrtnər | A noun Partner (Mask.)/ Partnerin (Fem.) ▸ partner in crime Komplize (Mask.)/ Komplizin (Fem.) (derogatory) ▸ be a partner in a firm Teilhaber/-haberin einer Firma sein ▸ junior/senior partner Junior (Mask.), Senior (Mask.) ▸ [dancing] partner Tanzpartner (Mask.)/ Tanzpartnerin (Fem.) ▸ take your partners bitte Aufstellung nehmen ▸ tennis partner Tennispartner (Mask.)/ Tennispartnerin (Fem.) ▸ croquet partner Krocketpartner (Mask.)/ Krocketpartnerin (Fem.) ▸ partner [in marriage] Ehepartner (Mask.)/ Ehepartnerin (Fem.) see also sleeping partner B transitive verb 1 (make a partner) partner sb with sb jmdn. mit jmdm. zusammenbringen ▸ be partnered with sb jmds. Partner/Partnerin sein 2 (be partner of) partner sb jmds. Partner/Partnerin sein ▸ partner sb at tennis/in the dance mit jmdm. Tennis spielen/tanzen