persever: stressed on the second syllable; Oliver will persever (persist in a course of action) to enjoy (marry, obtain, possess) her. In order to enjoy (take sexual pleasure of) her he must persever ("stand to", have an erection).

enjoy: marry

giddinesse: a) rashness, impulsiveness; b) passion or lust

the povertie of her: her povery (being without dowry)

consent: agree

revennew: income

estate: settle