proviso
noun /prəˈvaɪzəʊ/
/prəˈvaɪzəʊ/
(plural provisos)
(formal)- a condition that must be accepted before an agreement can be made
限制条款；附文；但书 - Their participation is subject to a number of important provisos.
他们的参与受一些重要条款的限制。 - He agreed to their visit with the proviso that they should stay no longer than one week.
他同意他们来做客，但条件是逗留不得超过一周。
词源late Middle English: from the medieval Latin phrase proviso (quod) ‘it being provided (that)’, from Latin providere ‘foresee, provide’. - Their participation is subject to a number of important provisos.