n.

1. （多面體的）面；（寶石等的）琢面
2. （問題等的）一個方面

vt.

1. 在（寶石等）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.