in the event that

Should it happen

In the event that means if or should something happen—a formal way of introducing a contingency: In the event that the flight is canceled, we'll take the train.

The phrase appears often in legal and business writing, where precision matters.

In casual speech, plain "if" usually suffices.

Related

on the off chance · supposing · contingent · as long as · unless · assuming · if and when · hypothetical · what if · heaven forbid · potentially · possibility · anticipate · imagine · whether · envision · likelihood · barring

Opposites
certainty/contingency

in the event thatunconditionally

Without any limitations

regardless · no matter what · certainly · definitely · inevitably

temporal realization

in the event thatnow that

Because something has occurred

seeing that · seeing as · given that · inasmuch as · once

Family

event, that, events, eventful, eventfully, uneventful, uneventfully, eventual, eventually

Familiarity
Top 200,000
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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G