[pawr-shuhn, pohr-]
a part of any whole, either separated from or integrated with it: I read a portion of the manuscript.
an amount of food served for one person; serving; helping: He took a large portion of spinach.
the part of a whole allotted to or belonging to a person or group; share.
the part of an estate that goes to an heir or a next of kin.
Literary. something that is allotted to a person by God or fate.
(especially formerly) the money, goods, or estate that a woman brings to her husband at marriage; dowry.
verb (used with object)
to divide into or distribute in portions or shares (often followed by out ).
to furnish with a portion, as with an inheritance or a dowry: All of his children have been amply portioned.
to provide with a lot or fate: She was portioned with sorrow throughout her life.

1250–1300; Middle English porcion < Old French < Latin portiōn- (stem of portiō) share, part, akin to pars part

portionable, adjective
portionless, adjective
reportion, verb (used with object)
unportionable, adjective
unportioned, adjective

portion, potion.

1. section, segment. See part. 2. ration. 3. allotment, quota, lot, dividend. 4. inheritance. 5. fortune, lot, destiny, doom. 7. allot, apportion. 8. endow.

1. whole.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
portion (ˈpɔːʃən)
1.  a part of a whole; fraction
2.  a part allotted or belonging to a person or group
3.  an amount of food served to one person; helping
4.  law
 a.  a share of property, esp one coming to a child from the estate of his parents
 b.  the property given by a woman to her husband at marriage; dowry
5.  a person's lot or destiny
6.  to divide up; share out
7.  to give a share to (a person); assign or allocate
8.  law to give a dowry or portion to (a person); endow
[C13: via Old French from Latin portiō portion, allocation; related to parspart]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

c.1300, from O.Fr. porcion (12c.), from L. portionem (nom. portio) "share, part," accusative of the noun in the phrase pro portione "according to the relation (of parts to each other)" (see proportion). The verb meaning "to divide in portions" is recorded from early 14c.
Online Etymology Dictionary, © 2010 Douglas Harper
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