Definitions
1.NounA seal, as of a letter.
2.NounA special characteristic or quality; prestige, especially via association."I remember when this diner was a quiet hangout, but lately it seems to be losing its cachet."
3.NounA commemorative stamped design or inscription on an envelope, other than a cancellation or pre-printed postage.
4.NounA sealed envelope containing an item whose price is being negotiated.
5.NounA capsule containing a pharmaceutical preparation.
6.NounA hidden location from which one can observe birds while remaining unseen.
7.VerbTo mark (an envelope) with a commemorative stamped design or inscription.