We found 16 dictionaries that define the word at a time:

General (15 matching dictionaries)

1. at a time: Merriam-Webster
2. at a time: Oxford Learner's Dictionaries
3. at a time: Vocabulary.com
4. at-a-time: Wordnik
5. at a time: Cambridge Advanced Learner's Dictionary
6. at a time: Wiktionary
7. at a time: Dictionary.com
8. at a time: Rhymezone
9. at a time: FreeDictionary.org
10. at a time: Mnemonic Dictionary
11. at a time: TheFreeDictionary.com
12. at a time: Longman Dictionary of Contemporary English
13. at a time: Merriam-Webster

Miscellaneous (1 matching dictionary)

14. at a time: Idioms

Definitions from WordNet (at a time) ▸ adverb:  simultaneously ("He took three cookies at a time") Phrases: one at a time, character at a time printer, line at a time printer, page at a time printer, one step at a time, more... ▸ Words similar to at a time ▸ Usage examples for at a time ▸ Idioms related to at a time ▸ Wikipedia articles (New!) ▸ Words that often appear near at a time ▸ Rhymes of at a time ▸ Invented words related to at a time