What is Portion ?
Portion is (noun) 1. a part This is only a small portion of the material we collected. Our carriage was in the rear portion of the train. 2. a serving of food, usually for one person The portions in that French restaurant are tiny. Ask the waiter if they serve children’s portions. (verb) to portion something out to share something out We portioned out the money between the four of us.
source: Easier English, Student Dictionary Upper Intermediate Level