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1.
A synonym for understanding
"We had an unspoken understandment of how the rotation for who rode shotgun works."
by Mav1101 February 28, 2012
 
2.
A extra way of saying understanding in past tense.
I truly wish i had the understandment i have now.
by Alexzander oliver August 31, 2011
 
3.
The combination of understanding and agreement. Used when talking about informal commitment.
we aren't dating but we have an understandment not to fool around with other people.
by Audrey N October 29, 2007