We found 4 dictionaries that define the word best in class:

General (2 matching dictionaries)

1. best in class: Longman Dictionary of Contemporary English
2. best in class: Wiktionary

Business (1 matching dictionary)

3. BusinessDictionary.com (No longer online)

Computing (1 matching dictionary)

4. best-in-class: Encyclopedia

Definitions from Wiktionary (best in class) ▸ adjective:  The best of something's kind. ▸ Words similar to best in class ▸ Usage examples for best in class ▸ Idioms related to best in class ▸ Wikipedia articles (New!) ▸ Popular nouns described by best in class ▸ Words that often appear near best in class ▸ Rhymes of best in class ▸ Invented words related to best in class