Webster's English Dictionary

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dilatation

di.la.ta.tion \.dil-*-'ta--sh*n, .di--l*-\ \-shn*l, -sh*n-*l\ n 1: 
   amplification in writing or speech  2a: the condition of being stretched 
   beyond normal dimensions esp. as a res ult of overwork or disease {~ of the 
   heart} or of abnormal relaxation {~ of the stomach} 2b: DILATION  3: the 
   act of expanding : the state of being expanded  4: a dilated part or 
   formation  - di.la.ta.tion.al aj