We found 6 dictionaries that define the word when first seen:

General (6 matching dictionaries)

1. when first seen: Vocabulary.com
2. when first seen: Dictionary.com
3. when first seen: Rhymezone
4. when first seen: FreeDictionary.org
5. when first seen: Mnemonic Dictionary
6. when first seen: TheFreeDictionary.com

Definitions from WordNet (when first seen) ▸ adverb:  as a first impression Types: novel, unfamiliar, unusual, uncommon, rare, unprecedented, more... ▸ Words similar to when first seen ▸ Usage examples for when first seen ▸ Idioms related to when first seen ▸ Wikipedia articles (New!) ▸ Words that often appear near when first seen ▸ Rhymes of when first seen ▸ Invented words related to when first seen