Webster's English Dictionary

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ablative

1. ab.la.tive \'ab-l*t-iv\ aj : of, relating to, or constituting a 
   grammatical case expressing typicall y the relations of separation and 
   source and also frequently such relations as cause or instrument - ablative 
   n
2. ab.la.tive \a-'bla-t-iv\ aj : tending to ablate