/ prəˈvaɪzəʊ; NAmE -zoʊ/ noun
( pl. -os ) a condition that must be accepted before an agreement can be made
SYN provision :
Their participation is subject to a number of important provisos.
He agreed to their visit with the proviso that they should stay no longer than one week.
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WORD ORIGIN
late Middle English : from the medieval Latin phrase proviso (quod) it being provided (that), from Latin providere foresee, provide.