Reasonable cause

1  : See also probable cause
: a fact or circumstance that justifies a reasonable suspicion
compare reasonable suspicion
2  : a reason that would motivate a person of ordinary intelligence under the circumstances <reasonable cause to believe abuse had occurred>
3  : something (as an event or the exercise of ordinary care or prudence) that excuses or justifies failure to file a tax return on time

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Based on Merriam-Webster's Dictionary of Law ©2001.
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