KEY: Volume.
SYN: Size, body, bulk, dimensions, book, work, tome, capacity, magnitude, compass, quantity.
ANT: diminutiveness, tenuity, minuteness, smallness.
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KEY: Voluntary.
SYN: Deliberate, {[spaaimneous]?}, free, intentional, optional, discretional, unconstrained, willing.
ANT: compulsory, coercive, necessitated, involuntary.
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KEY: Volunteer.
SYN: Offer, proffer, tend, originate.