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

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adj. Very fast, or of very short duration; especially concerning events that take place in femtosecond or picosecond timescales.

"Zewail and his colleagues have achieved this by introducing the fourth dimension of time into high-resolution electron microscopy, in what has been termed ultrafast "single-electron" imaging, where every electron trajectory is precisely controlled in time and space."

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