upon

US /əˈpɑn/

Definition

the quality, condition, or instance of upon

Tested in TOEIC business and workplace contexts.

Upon arrival, guests should register at the front desk immediately.

Easy once upon a time
describing once upon a time (on one occasion)
Medium upon receipt of the payment
a collocation phrase: upon receipt of the payment
Hard contingent upon regulatory approval
describing contingent upon regulatory approval (a gathering of persons representative of some larger group)
Very Hard disaster was visited upon the reckless dynasty
describing disaster was visited upon the reckless dynasty (a state of extreme (usually irremediable) ruin and misfortune)

Learner's English edition · Curated definitions for TOEIC learners.