# Measurement of speed in relation to sound — Crossword Clue Answer

Last seen 2026-10-20

Answer: **MACH** (4 letters)

Appeared in:
- Everyday Puzzles Cladder, 2026-10-20
- Everyday Puzzles Cladder, 2026-01-22
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Source: https://cluestash.com/clue/measurement-of-speed-in-relation-to-sound/