1 segment, part, section, division, subdivision, parcel, piece, hunk, chunk, lump, wedge, slice, sliver, fraction, fragment, bit, morsel, scrap:
A portion of the masonry fell into the street in the earthquake.
2 share, part, allotment, quota, ration, apportionment, allowance, allocation, assignment, percentage, measure, division, quantity:
The size of an investor's portion depends on the amount invested.
3 helping, serving; ration, plate, platter:
He complained that the portions in nouvelle cuisine are too small.
4 Often, portion out. apportion, share out, allocate, ration, allot, partition, assign, consign, dole out, deal (out), parcel out, distribute, administer, dispense, disperse, divide, split up, carve up, cut up, break up, section, Colloq divvy up:
The conquered territories were then portioned out among the victors.