Accumulative, a. — Webster enters it under “accumulative”
Characterized by accumulation; serving to collect or amass; cumulative; additional. -- Ac*cu"mu*la*tive*ly, adv. -- Ac*cu"mu*la*tive*ness, n.
Shades of meaning
Fernald lists accumulatively only as an antonym, under apiece.
He lists it without comment; the entries above explain its neighbors.
Synonyms
none given