Webster's English Dictionary

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thank

1. thank \'thank\ n [ME, fr. OE thanc thought, gratitude; akin to OHG dank 
   gratitude, L] tonge-re to know pl  1: kindly or grateful thoughts : 
   GRATITUDE  2a: an expression of gratitude - usu. used in pl. {~s} (~s for 
   helping me} pl  2b: an expression of gratitude to God before or after a 
   meal {return ~ s}
2. thank vt 1: to express gratitude to {~ed her for the present} - u sed in 
   the phrase thank you usu. without a subject to politely express gratitude 
   {~ you for the loan} 2: to hold responsible