مبتدا mubtadā A (part. pass. VIII. of بدأ) s. f. 1. Commencement, principle, or subject of a pro- position. 2. Substantive noun in the nomina- tive case. مبتدا وخبر mubtadā-o-ḵẖabar, s. f. The subject and predicate, or substantive and adjective (in syntax).