Im*plo"sion (?), n. [Formed by substitution of pref. im- in for pref. ex- in explosion.] 1. A bursting inwards, as of a vessel from which the air has been exhausted; -- contrasted with explosion.

2. (Phon.) A sudden compression of the air in the mouth, simultaneously with and affecting the sound made by the closure of the organs in uttering p, t, or k, at the end of a syllable (see Guide to Pronunciation, §§159, 189); also, a similar compression made by an upward thrust of the larynx without any accompanying explosive action, as in the peculiar sound of b, d, and g, heard in Southern Germany. H. Sweet.

• The inrush of air in forming a suction stop.
  
• The action of imploding.
  
• The act or action of bringing to or as if to a center.