IPA: /prəˈvaɪzoʊ/
KK: /prəˈvaɪzoʊ/
A specific condition or requirement that must be met in a legal document or agreement.
The contract included a proviso that the work must be completed by the end of the month.
Proviso is derived from the Latin "provisus" (meaning foreseen) which comes from "pro-" (meaning before) and "videre" (meaning to see). The word refers to a condition or stipulation that is foreseen or anticipated in an agreement.
Think of something that is 'foreseen' ('pro-' means before and 'videre' means to see) — a proviso is a condition that you see coming before making an agreement.