activity

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activity displacement optical activity

Main Entry: ac·tiv·i·ty
Pronunciation: ak-tiv-t-
Function: noun
Inflected Form(s): plural -ties
1 : natural or normal function: as a : a process (as digestion) that an organism carries on or participates in by virtue of being alive b : a similar process actually or potentially involving mental function; specifically : an educational procedure designed to stimulate learning by firsthand experience
2 : the characteristic of acting chemically or of promoting a chemical reaction <the activity of a catalyst>