Source : Webster's Revised Unabridged Dictionary (1913)

Reenforcement \Re`["e]n*force"ment\ (r?`?n*f?rs"ment), n.
   1. The act of re["e]nforcing, or the state of being
      re["e]nforced.

   2. That which re["e]nforces; additional force; especially,
      additional troops or force to augment the strength of any
      army, or ships to strengthen a navy or fleet.

Source : WordNet®

reenforcement
     n 1: information that makes more forcible or convincing; "his
          gestures provided eloquent reinforcement for his
          complaints" [syn: {reinforcement}]
     2: a military operation (often involving new supplies of men
        and materiel) to strengthen a military force or aid in the
        performance of its mission; "they called for artillery
        support" [syn: {support}, {reinforcement}]