Search Dictionary
Definition of tachograph

tachograph

/ˈtæk.ə.ɡræf/
tach · o · graph
Plural:tachographs
JUMP TO:

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

tablet
tabor
tacca
tachograph
tachometer
tack
tackle

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 Oct 16, 2026, from https://wordmom.com/dictionary/tachograph
Wordmom is your complete guide to the English language. Whether you're looking up a definition, searching for the perfect synonym, or unscrambling letters for a word game, our comprehensive suite of tools is designed to help you find the right word, every time.
Word Games & Solvers
Word FinderScrabble Word FinderWords With Friends CheatWordle SolverAnagram Solver
Dictionary & Reference
DictionarySynonymsAntonymsWords
Community
Contact UsEditorial PolicyPrivacy PolicyTerms and Conditions
© 2016–2026 Wordmom Network. All rights reserved. Made with for word lovers everywhere.
Disclaimer: SCRABBLE®, Words With Friends®, Wordle®, and related game titles or tournament codes are registered trademarks of their respective owners (including Hasbro, Mattel, Zynga, The New York Times, NASPA, and WESPA). Wordmom is an independent reference utility for educational and entertainment purposes, not affiliated with, sponsored, or endorsed by these entities. All game names are referenced strictly under nominative fair use for compatibility.