lust

Short definition from Wiktionary

Noun

1. 1
   A feeling of strong desire, especially such a feeling driven by sexual arousal.
2. 2
   A general want or longing, not necessarily sexual.
3. 3
   A delightful cause of joy, pleasure.
4. 4
   Virility; vigour; active power.

Verb

1. 1
   To look at or watch with a strong desire, especially of a sexual nature.
2. 2
   To desire.