Brown Driver Briggs

 1. to discern, understand, consider
  1) (Qal)
1a1. to perceive, discern
1a2. to understand, know (with the mind)
1a3. to observe, mark, give heed to, distinguish, consider
1a4. to have discernment, insight, understanding
  2) (Niphal) to be discerning, intelligent, discreet, have understanding
  3) (Hiphil)
1c1. to understand
1c2. to cause to understand, give understanding, teach
  4) (Hithpolel) to show oneself discerning or attentive, consider diligently
  5) (Polel) to teach, instruct
2. (TWOT) prudent, regard