UBS Dictionary of the Greek New Testament

Sense 1: suddenly, at once, immediately (in a number of contexts there is the implication of unexpectedness, but this seems to be a derivative of the context as a whole and not a part of the meaning of the lexical items)

Semantic entry: 67.113

Semantic domains: Time

Subdomains: Duration of Time without Reference to Points or Units of Time: Time, Spend Time, Always, Eternal, Old, Immediately, Young

Definition: pertaining to an extremely short period of time between a previous state or event and a subsequent state or event