Source : Webster's Revised Unabridged Dictionary (1913)

Inlet \In"let\, n.
   1. A passage by which an inclosed place may be entered; a
      place of ingress; entrance.

            Doors and windows,inlets of men and of light. --Sir
                                                  H. Wotton.

   2. A bay or recess,as in the shore of a sea, lake, or large
      river; a narrow strip of water running into the land or
      between islands.

   3. That which is let in or inland; an inserted material.

   Note: Inlet is also usewd adjectively,as in inlet pipe, inlet
         valve, etc.

Source : WordNet®

inlet
     n : an arm off of a larger body of water (often between rocky
         headlands) [syn: {recess}]