co·mit·a·tive 
(kə-mĭtə-tĭv, kŏm′ĭ-tā-)
(kə-mĭtə-tĭv, kŏm′ĭ-tā-)adj.
Of, relating to, or being the grammatical case indicating accompaniment in some languages, as in Finnish professorine "(along) with the professor."
n.
1. The comitative case.
2. A word or form in the comitative case.
[Latin comitārī, comitāt-, to accompany (from comes, comit-, companion; see COUNT2) + -IVE.]