This verb root is in the meaning of ‘dividing or making parts of something’ according to the Kavikalpadruma. The penultimate phoneme is the palatal. The meaning given as vibhājanam is from the verb root ‘bhāj’ which has the meaning of separation. The example is ‘aṃśayati aṃśāpayati dhanaṃ vaṇik (which means ‘the merchant divides the money into parts’) according to Durgādāsa’s Dhātudīpikā.
Sometimes transliterated as: Amsa, AMZa, Amsha
Ref: अंशयति अंशापयति धनं वणिक् ।