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Titis paper airns to set a titeoretical basis for concept forrnation. Sorne definitions of tite ter». concept, given tn tite psycitological literature are reviewed asad one definition Ls proposed. A possible hierarcity of concepts useful for teaching tite». Ls presented. Tite process of learning concepts titrough definitions, as it itappens isa reading texts or consulting dictionaries Ls examined botit it. itsforrnaland itspsychologicalaspects. A method for teaching concepts through definitions is propossed. FinaIly, sorne bonds between conceptual behavior asid language are pointed out.