momentum

mastery
UK /ˌmə(ʊ)ˈmɛntəm/ US /ˌmoʊˈmɛntəm/noun

card 1 of 10 · synonym

Which word is closest in meaning to 'momentum' in this sentence?

Their intention to become husband and wife, at first halting and timorous, had accumulated momentum with the lapse of hours.