se·ries noun \ˈsi(ə)r-(ˌ)ēz\
: a number of things or events of the same class coming one after another in spatial or temporal succession <described a new series of cases>
: a group of specimens or types progressively differing from each other in some morphological or physiological attribute <a series of antitoxins>
: a group of chemical compounds related in composition and structure
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