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Definition of seal : 1. A compound hydraulic valve for regulating the passage of the gas through a set of purifiers so as to cut out each one in turn for the renewal of the lime.
2. Among the Mormons, to confirm or set apart as a second or additional wife.
3. An arrangement for preventing the entrance or return of gas or air into a pipe, by which the open end of the pipe dips beneath the surface of water or other liquid, or a deep bend or sag in the pipe is filled with the liquid; a draintrap.
4. An engraved or inscribed stamp, used for marking an impression in wax or other soft substance, to be attached to a document, or otherwise used by way of authentication or security.
5. Any aquatic carnivorous mammal of the families Phocidae and Otariidae.
6. Hence, to shut close; to keep close; to make fast; to keep secure or secret.
7. That which confirms, ratifies, or makes stable; that which authenticates; that which secures; assurance.
8. That which seals or fastens; esp., the wax or wafer placed on a letter or other closed paper, etc., to fasten it.
9. To affix one's seal, or a seal.
10. To close by means of a seal; as, to seal a drainpipe with water. See 2d Seal, 5.
11. To fasten with a seal; to attach together with a wafer, wax, or other substance causing adhesion; as, to seal a letter.
12. To fix, as a piece of iron in a wall, with cement, plaster, or the like.
13. To mark with a stamp, as an evidence of standard exactness, legal size, or merchantable quality; as, to seal weights and measures; to seal silverware.
14. To set or affix a seal to; hence, to authenticate; to confirm; to ratify; to establish; as, to seal a deed.
15. Wax, wafer, or other tenacious substance, set to an instrument, and impressed or stamped with a seal; as, to give a deed under hand and seal.

Synonyms:

mould, revenue stamp, cast, seal of approval, sealing wax, seal off, mold, postage stamp, stamp, impression, pestle, tender, sealskin, lettre de cachet, cachet, varnish, legal tender, blockade, postage

badge (part of speech: noun)

orb, wand, signet, regalia, tartan, ermine, badge, ring, insignia, baton, scepter, crown, mantle, coronet, talisman, tiara, uniform, emblem, staff, pall, mortarboard

approval (part of speech: noun)

authorization, allowance, permit, permission

close (part of speech: verb)

fasten, barricade, secure, jam, join, shut, block, close, stop

closure (part of speech: noun)

cork, plug, stopper, obstruction, choke

fastener (part of speech: noun)

closure, binder, hook, string, tape, binding, anchor, cinch, knitting, thread, brad, tie, agent, hinge, middleman, stay, bonding, clamp, hitch, pin, rivet, skewer, zipper, fuse, hasp, belt, lock, twine, mediator, knot, hawser, tack, stitch, braid, mucilage, glue, brace, chain, medium, paste, staple, splice, bolt, fastening, bracket, snap, bond, weld, cement, ligament, latch, connector, grapnel, link, spike, suture, guy, buckle, strap, rabbet, catch, lace, vise, button, clip, cotter, go-between, band, fastener, nail, vinculum, clasp, coupling, cincture, clinch, cleat

Usage examples: