Webster's English Dictionary

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escalator

1. es.ca.la.tor \'es-k*-.la-t-*r\ n [fr. Escalator, a trademark] 1: a 
   power-driven set of stairs arranged like an endless belt that ascend o r 
   descend continuously 2: an escalator clause or provision 
2. escalator aj : providing for a periodic proportional upward or downward 
   adjustment (as  of prices or wages) {an ~ clause}