This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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ad. At once.

ad. With insistence; urgently.

conjunction. Chiefly British As soon as.

ad. Without the least delay or interval; at once; immediately.

ad. With urgency or importunity; earnestly; pressingly.

At the same time; simultaneously.

Immediately after; without any intervening time: as, to be instantly killed.

With urgency; insistently; earnestly; assiduously.

ad. without any delay

ad. without delay or hesitation; with no time intervening

"She changed her expression instantly to one of gratitude and then reached out to take my hand."

directly    at once    immediately    earnestly    pressingly