We found 9 dictionaries that define the word as needed:

General (7 matching dictionaries)

1. as needed: Vocabulary.com
2. as-needed: Wordnik
3. as needed: Dictionary.com
4. as needed: Rhymezone
5. as needed: FreeDictionary.org
6. as needed: Mnemonic Dictionary
7. as needed: TheFreeDictionary.com

Computing (1 matching dictionary)

8. as needed: Encyclopedia

Medicine (1 matching dictionary)

9. as needed: Medical dictionary

Definitions from WordNet (as needed) ▸ adverb:  according to need (physicians use PRN in writing prescriptions) ("Add water as needed") Opposite: unnecessary, surplus, excess, superfluous Types: ad hoc, on-demand, on as-needed basis, more... Phrases: Take as Needed for Pain, as much as needed, as much as needed, meds you can take as needed, as long as needed, more... ▸ Words similar to as needed ▸ Usage examples for as needed ▸ Idioms related to as needed ▸ Wikipedia articles (New!) ▸ Words that often appear near as needed ▸ Rhymes of as needed ▸ Invented words related to as needed