We found 9 dictionaries that define the word week by week:

General (8 matching dictionaries)

1. week by week: Oxford Learner's Dictionaries
2. week by week: Vocabulary.com
3. week by week: Cambridge Advanced Learner's Dictionary
4. week by week: Dictionary.com
5. week by week: Rhymezone
6. week by week: FreeDictionary.org
7. week by week: Mnemonic Dictionary
8. week by week: TheFreeDictionary.com

Miscellaneous (1 matching dictionary)

9. week by week: Idioms

Definitions from WordNet (week by week) ▸ adverb:  weekly ("Week by week, the betrayal gnawed at his heart") ▸ Words similar to week by week ▸ Usage examples for week by week ▸ Idioms related to week by week ▸ Wikipedia articles (New!) ▸ Words that often appear near week by week ▸ Rhymes of week by week ▸ Invented words related to week by week