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1. stoichiometry - (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers).
Top definition. Stoicism. 1. A systematic philosophy, dating from around 300 b.c., that held the principles of logical thought to reflect a cosmic reason instantiated in nature. 2. (As written in lowercase) To conduct conforming to the precepts of the Stoics, as repression of emotion and indifference to pleasure or pain.