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Pronunciation varies by accent · adjective
Very fast, or of very short duration; especially concerning events that take place in femtosecond or picosecond timescales..
Use ultrafast when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Ultrafast means Very fast, or of very short duration; especially concerning events that take place in femtosecond or picosecond timescales..
The closest synonym depends on the sentence and intended sense.
The opposite depends on the specific sense.
Use ultrafast where its definition matches the intended context.
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