معمَعَ [generally thus in all cases] is a word, or noun, (S, K,) or particle, (K,) denoting concomitance, (S, K,) &c. (K.) It is said to denote the commencement of concomitance, though this is not invariably the case. (MF and TA, voce فِى.) b2:  جِئْتُ مَعَ العَصْرِ meansعِنْدَ العَصْرِ. (Mughnee.)