proviso

 
Pronunciation: /prəˈvʌɪzəʊ/

noun (plural provisos)

  • a condition or qualification attached to an agreement or statement: he let his house with the proviso that his own staff should remain to run it

Origin:

late Middle English: from the medieval Latin phrase proviso (quod) 'it being provided (that)', from Latin providere 'foresee, provide'