# ultrafast

> English word · Adjective · frequency rank #70,357

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

## Etymology
From ultra- + fast.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/ultrafast