from the GNU version of the Collaborative International Dictionary of English
- prep. for the existing occasion; as matters are.
from The Century Dictionary and Cyclopedia
- For some contingency that arises unexpectedly or out of due course.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- adv. according to need (physicians use PRN in writing prescriptions)
Sorry, no etymologies found.