Webster's English Dictionary

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quantum

quan.tum \'kwa:nt-*m\ \-*\ n or quan.ta [L, neut. of quantus how much] pl  
   1a: QUANTITY, AMOUNT  1b: PORTION, PART  1c: gross quantity : BULK  2a: one 
   of the very small increments or parcels into which many forms of en ergy 
   are subdivided 2b: one of the small subdivisions (as velocity) of a 
   physical magnitude