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Definition of tachograph

tachograph

/ˈtæk.ə.ɡræf/
tach · o · graph
Plural:tachographs
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tachograph Lexical Profile

tachograph Game Scores & Validity

• noun

1

An electronic or mechanical instrument fitted to a commercial vehicle, such as a truck or bus, that automatically records its speed, distance traveled, and the driver's driving and rest times.

Example

"Commercial truck drivers are legally required to use a tachograph to ensure they do not exceed their maximum permitted driving hours."

Synonyms
View all synonyms for tachograph

Word Nuance & Usage

Often confused with 'tachometer'; a tachometer measures the working speed of an engine (RPM), whereas a tachograph records a vehicle's speed and driver activity over time for regulatory compliance.

• Nearby Words

tacca
tach
tache
tachograph
tachometer
tacit
tacitly

Word Origin & Etymology

Coined in the late 19th century from the Greek root 'takhos' meaning 'speed' combined with the suffix '-graph' meaning 'instrument for recording'.

Usage Trend

Historical frequency of usage in published text.

180019102020
Data source: Google Books Ngram Viewer

Cite this Entry

Wordmom. (2026). Definition of Tachograph. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/tachograph
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