AV - seal 22, set to (one's) seal 1, stop 1, seal up 1, set a seal 1, vr seal 1; 27
1) to set a seal upon, mark with a seal, to seal
1a) for security: from Satan
1b) since things sealed up are concealed (as the contents of a letter), to hide, keep in silence, keep secret
1c) in order to mark a person or a thing
1c1) to set a mark upon by the impress of a seal or a stamp
1c2) angels are said to be sealed by God
1d) in order to prove, confirm, or attest a thing
1d1) to confirm authenticate, place beyond doubt
1d1a) of a written document
1d1b) to prove one's testimony to a person that he is what he professes to be