Sentence:  <WSD>Alibi</WSD> is different from all of the other defenses . . . it is based upon the premise that the defendant is truly innocent.<!-- material copied from Webster's Revised Unabridged Dictionary (1913) --><!-- additional material moved from Wikipedia article Alibi, which should be consulted for historical editing information. --> 
Meaning of the word marked with <WSD> tags:  The plea or mode of defense under which a person on trial for a crime proves or attempts to prove being in another place when the alleged act was committed