To bargain or stipulate together with someone; to make a mutual agreement or covenant.
From Latin 'ad-' (to) + 'stipulari' (to bargain, stipulate), meaning to engage in mutual agreement. An extremely rare legal and philosophical term from medieval and early modern English.
This bizarre relic of contract language shows how English once loved prefix-stacking to nuance meaning—'stipulate' alone means to demand a term, but 'adstipulate' meant to negotiate mutually, a distinction we've abandoned for clearer phrasing.
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