EN
Register motivation (RM) represents one of 17 types of lexical motivation. The termregister motivationrefers to the term(communication) registerwhich is defined as situationally conditioned language behaviour of people connected by their common activity (D. Slančová). Register lexical units are thus situationally conditioned (such as child lexis, sport lexis etc.). Moreover, the relation among lexis, register and sociolect is analyzed. Finally, the relation of RM with other types of motivation (e.g. paradigmatic, word-formation, phraseological, syntactic and interlingual motivation) is outlined.