n.

1. （多面体的）面；（宝石等的）琢面
2. （问题等的）一个方面

vt.

1. 在（宝石等）上琢面

n.

1. one side of something many-sided, especially of a cut gem.
2. an aspect or feature:
   different facets of the truth.
3. Zoology  any of the individual units that make up the compound eye of an insect or crustacean.