1) to agree together, appoint a time 1a) (Ithpael) to agree beforehand
Full Brown-Driver-Briggs lexicon entry
[זְמַן] verb denominative Hithpa`elagree together (ᵑ7); — Perfect 3 masculine plural Dan 2:9 Qr הִזְדַּמִּנְתּוּן (D211, 2nd ed. 263 M§ 12 a; Kt Haph`elהַזְמִנְתּוּן, see ᵑ7OnkExod 5:14 D (2) 263, 403), followed by Infinitive לְמֵאמַר.