PTS Pali-English dictionary - The Pali Text Society's Pali-English dictionary
Patijīvan
Patijīvan,(-°) in phrase jīva-paṭijīvaṁ at J.II,15 is to be taken as a sort of redupl.cpd.of jīva,the imper.of jīvati “live,” as greeting.We might translate “the greeting with “jīva” and reciprocating it.” (Page 395)