Coalescence(noun)
(To unite so as to form one mass, community, etc)
Hindi meaning:एकीकरण
Synonyms: Integration, Unification, Combination
Antonyms: Individual, Opening
Example: The cornea is formed by the coalescence of two structures. Related words: coalesce (verb), coalescent (adjective)
Trick to remember: Kohli team me Coalescence ko improve kar rhe hai. 
