portion-n; 4 Senses

Sense Number 1: a part or component of a larger whole

Commentary: PORTION[+relation][+part][+component][+whole]
NOTE: does not imply an allotment of something (see Sense 2)

The young actor could recite lengthy portions of Shakespeare on command.
Only a portion of the original castle is still standing.
The rear portion of the house looks out over a wooded landscape.

WordNet 3.0 Sense Numbers: 1, 2

Sense Number 2: an allotment or percentage of something

Commentary: PORTION[+quantity][+allotment][+percentage][+wealth/+time/+luck]
NOTE: implies the portion is transferred to someone or something

She gave a significant portion of her wealth to charity.
John has had more than his portion of bad luck this year. figurative extension, he got more than others did
The villager's daughter brought a sizable portion to her new husband. (dowry)
A great portion of their energy was devoted to community activities.

WordNet 3.0 Sense Numbers: 3, 4, 6

Sense Number 3: one's fate or circumstances in general

Commentary: PORTION[+state][+circumstances][+fate]

What will be our portion in life?
The portion of an average peasant during the Middle Ages was difficult and fairly monotonous.

WordNet 3.0 Sense Numbers: 5

Sense Number 4: a serving or helping of food

Commentary: PORTION[+quantity][+allotment][+serving][+food]
NOTE: a narrow, specialized usage of Sense 2

This restaurant serves very generous portions.
John always has second portions of everything at Thanksgiving dinner.
Cut the cake into twelve portions.
Mary's diet consists of portion control.

WordNet 3.0 Sense Numbers: 7