Webster's English Dictionary

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biology

bi.ol.o.gy \bi--'a:l-*-je-\ n [G biologie, fr. bi- + -logie -logy] often 
   attrib  1a: a branch of knowledge that deals with living organisms and 
   vital proces ses 1b: ECOLOGY  2a: the plant and animal life of a region or 
   environment  2b: the laws and phenomena relating to an organism or group