1 a device impressed on a piece of wax, moist clay, etc., fixed to a letter, document, etc., as a mark of authentication
2 a stamp, ring, etc., engraved with a device to form such an impression
3 a substance, esp. wax, so placed over an envelope, document, etc., that it must be broken before the object can be opened or used
4 any substance or device used to close or fasten tightly
5 a material, such as putty or cement, that is used to close an opening to prevent the passage of air, water, etc.
6 a small amount of water contained in the trap of a drain to prevent the passage of foul smells
7 an agent or device for keeping something hidden or secret
8 anything that gives a pledge or confirmation
9 a decorative stamp often sold in aid of charity
10 (R.C. Church, Also called) seal of confession the obligation never to reveal anything said by a penitent in confession
set one's seal on (or to)
a to mark with one's sign or seal
12 to affix a seal to, as proof of authenticity
13 to stamp with or as if with a seal
14 to approve or authorize
15 sometimes foll by: up to close or secure with or as if with a seal
to seal one's lips, seal up a letter
16 foll by: off to enclose (a place) with a fence, wall, etc.
18 (Mormon Church) to make (a marriage or adoption) perpetually binding
19 to close tightly so as to render airtight or watertight
20 to paint (a porous material) with a nonporous coating
21 (Austral. and N.Z.) to consolidate (a road surface) with bitumen, tar, etc.
(C13 seel, from Old French, from Latin sigillum little figure, from signum a sign)