Webster's English Dictionary

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dilute

1. di.lute or di.lu.tor \di--'lu:t, d*-\ \-'lu:t-*r\ vt [L dilutus, pp. of 
   diluere to wash away, dilute, partly fr. di-)X + lavere to wash, partly fr. 
   di- + luere to release, atone for 1: to make thinner or more liquid by 
   admixture  2: to diminish the strength, flavor, or brilliance of by 
   admixture  3: ATTENUATE  - di.lu.ter n
2. dilute aj : DILUTED, WEAK  - di.lute.ness n