Sinful longing; the inward sin which leads to the falling away from God (Romans 1:21). "Lust, the origin of sin, has its place in the heart, not of necessity, but because it is the centre of all moral forces and impulses and of spiritual activity." In Mark 4:19 "lusts" are objects of desire.

Noah Webster's New International Dictionary of the English Language

1. (n.) Pleasure.

2. (n.) Inclination; desire.

3. (n.) Longing desire; eagerness to possess or enjoy; -- in a had sense; as, the lust of gain.

4. (n.) Licentious craving; sexual appetite.

5. (n.) Hence: Virility; vigor; active power.

6. (n.) To list; to like.

7. (n.) To have an eager, passionate, and especially an inordinate or sinful desire, as for the gratification of the sexual appetite or of covetousness; -- often with after.