concept
n
1 an idea, esp. an abstract idea
the concepts of biology
2 (Philosophy) a general idea or notion that corresponds to some class of entities and that consists of the characteristic or essential features of the class
a the conjunction of all the characteristic features of something
b a theoretical construct within some theory
c a directly intuited object of thought
d the meaning of a predicate
4 modifier (of a product, esp. a car) created as an exercise to demonstrate the technical skills and imagination of the designers, and not intended for mass production or sale (C16: from Latin conceptum something received or conceived, from concipere to take in, conceive)
self-concept
n (Psychol) the whole set of attitudes, opinions, and cognitions that a person has of himself
English Collins Dictionary - English Definition & Thesaurus  

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"Collins English Dictionary 5th Edition first published in 2000 © HarperCollins Publishers 1979, 1986, 1991, 1994, 1998, 2000 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"