Webster's English Dictionary

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interjection

in.ter.jec.tion \.int-*r-'jek-sh*n\ n 1a: the act of uttering exclamations 
   : EJACULATION  1b: the act of putting in between : INTERPOSITION {~ of new  
   issues} 2: something that interrupts  3a: an ejaculatory word (as 
   Wonderful) or form of speech (as ha ha ) 3b: a cry or inarticulate 
   utterance (as ouch) expressing an emotion