What is the meaning of as needed?

adverb

  • According to need (physicians use PRN in writing prescriptions. )
    • usage: "add water as needed"
WordNet 3.0 © 2006 by Princeton University
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APAWordNet. (2010). as needed. Retrieved September 20, 2026, from http://smartdefine.org/as_needed/definitions/1250676
ChicagoWordNet. 2010. "as needed" http://smartdefine.org/as_needed/definitions/1250676 (accessed September 20, 2026).
HarvardWordNet 2010, as needed, Smart Define, viewed 20 September, 2026, <http://smartdefine.org/as_needed/definitions/1250676>.
MLAWordNet. "as needed" 23 October 2010. Web. 20 September 2026. <http://smartdefine.org/as_needed/definitions/1250676>