From BiblePortal Wikipedia

Webster's Dictionary [1]

(1): ( n.) Power to harm; subjection or liability to penalty.

(2): ( v. t.) To endanger.

(3): ( n.) Difficulty; sparingness.

(4): ( n.) Exposure to injury, loss, pain, or other evil; peril; risk; insecurity.

(5): ( n.) Coyness; disdainful behavior.

(6): ( n.) Authority; jurisdiction; control.

King James Dictionary [2]

Danger n. Peril risk hazard exposure to injury, loss, pain or other evil.

Our craft is in danger to be set at nought. Acts xix.

It is easy to boast of despising death, when there is no danger.

DANGER, To put in hazard to expose to loss or injury.

International Standard Bible Encyclopedia [3]

dān´jẽr  : Danger does not express a state of reality but a possibility. In  Matthew 5:21 f, however, and also the King James Version   Mark 3:29 (the Revised Version (British and American) "but is guilty of an eternal sin") the expression "danger" refers to a certainty, for the danger spoken of is in one case judgment which one brings upon himself, and in the other the committing of an unpardonable sin. Both are the necessary consequences of a man's conduct. The reason for translating the Greek ( ἔνοχος , énochos (literally, "to be held in anything so one cannot escape") by "is in danger," instead of "guilty" or "liable," may be due to the translator's conception of these passages as a warning against such an act rather than as a statement of the judgment which stands pronounced over every man who commits the sin.