Definitions:

1. The ability to distinguish between two or more things or people, recognizing the differences that make them unique. VERB
   • The two plants look almost the same to a novice, but a trained botanist can know them apart by their leaf patterns.
2. To have knowledge or clear perception, as of fact or truth. VERB
   • With his expertise in vintage cars, he can know apart a real classic from a replica just by looking at the details.
3. To recognize or perceive the difference. VERB
   • Even though the twins are identical, their mother can easily know them apart by their mannerisms.

Synonyms:

• decipher
• differentiate
• discern
• discriminate
• distinguish
• pick out
• recognize