Webster's English Dictionary

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quad

1. quad \'kwa:d\ n : QUADRANGLE 
2. quad n [short for quadrat] : a type-metal space that is 1 en or more in 
   width 
3. quad vt or quad.ded;  or quad.ding : to fill out (as a typeset line) 
   with quads 
4. quad n : QUADRUPLET