GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Erst , adv. [Orig. superlative of ere; AS. ǣrest. See Ere.] [Archaic]
    First.
   Chaucer.
   
   1913 Webster
   Previously; before; formerly; heretofore.
   Chaucer.
   
   1913 Webster
   Tityrus, with whose style he had erst disclaimed all ambition to match his pastoral pipe.
   A. W. Ward.
   
   1913 Webster
   At erst, at first; at the beginning. -- Now at erst, at this present time.
   Chaucer.
   
   1913 Webster