や否や／～や (ya-inaya): As soon as; no sooner than
～や否や／～や (ya-inaya)
Meaning
As soon as; no sooner than
Formation and usage
V dictionary + や（否や）
Notation: N = noun; V dictionary = dictionary-form verb; V stem = the stem before ます; plain clause = plain-form clause; negative stem = the form before ない. Follow the attachment shown above.
Explanation
Narrates an action immediately following another event, often in the past, not a suggestion.
Examples
会議が終わるや否や、皆が立ち上がった。
As soon as the meeting ended, everyone stood up.
試験が終わるや否や、皆が立ち上がった。
As soon as the exam ended, everyone stood up.
研修が終わるや否や、皆が立ち上がった。
As soon as the training session ended, everyone stood up.
発表会が終わるや否や、皆が立ち上がった。
As soon as the presentation event ended, everyone stood up.
面接が終わるや否や、皆が立ち上がった。
As soon as the interview ended, everyone stood up.
How related patterns differ
が早いか, なり, and や否や narrate an immediate following event. か～ないかのうちに suggests the first may not yet have finished. そばから often describes an action being repeated or undone, rather than simply a sequence.