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Use "cumulation" in a sentence
"For one, how can you really know someone unless you interact with them on a very personal level over a certain cumulation of time?"
"Now, a cumulation of mismanagement, inferior training, bad judgment calls and arrogance have come back to smack the force in the face."
"The key take-away from Mark's post is that relationships develop over time, and given the importance and longevity of the VC/founder relationship it benefits from the cumulation of interaction and data sharing between the parties."