Definitions by Daryna Vashchenko

Sentence definition
Motivation is an internal process that makes a person move toward a goal. Motivation, like intelligence, can not be directly observed.

Extended definition

Motivation is an internal process that makes a person move toward a goal. Motivation, like intelligence, can not be directly observed. The process of motivation can be initiated by someone recognizing an unsatisfied need. A goal is then established which, it is thought, will satisfy the need, and a course of action is determined which is expected to lead towards the attainment of the goal. People can be motivated by rewards and incentives, which will enable them to satisfy their needs or will provide them with goals to attain.

Sources:
1. http://www.sparknotes.com/psychology/psych101/motivation/section1.html
2. http://en.wikipedia.org/wiki/Motivation
3. Helen Murlis, Michael Armstrong Reward Management: A Handbook of Re-munaration Strategy and Practice. p.29