por·tion 
(pôrshən)
(pôrshən)n.
1. A section or quantity within a larger thing; a part of a whole.
2. A part separated from a whole.
3. A part that is allotted to a person or group, as:
a. A helping of food.
b. The part of an estate received by an heir.
c. A woman's dowry: marriage portion.
4. A person's lot or fate.
tr.v. por·tioned, por·tion·ing, por·tions
1. To divide into parts or shares for distribution; parcel.
2. To provide with a share, inheritance, or dowry.
[Middle English, from Old French, from Latin portiō, portiōn-; see perə-2 in the Appendix of Indo-European roots.]
portion·a·ble adj.