What does contraclockwise mean?
'Contraclockwise' means moving or oriented in the direction opposite to that in which a clock's hands travel — that is, to the left as seen from above. It is a variant form of the much more common word 'counterclockwise', formed with the prefix 'contra-' (meaning 'against') rather than 'counter-', and it appears chiefly in American English sources, though it remains rare in everyday use. The word works as an adverb when it describes how something moves, as in 'turn the key contraclockwise to unlock the door', and as an adjective when it describes an orientation or arrangement, as in 'a contraclockwise current'. In practice, most writers choose 'counterclockwise' instead, so encountering 'contraclockwise' is more likely in technical writing, older texts, or regional usage. Its opposite is 'clockwise'. For anyone describing rotation precisely — in cooking, mechanics, dance, or science — the word captures an exact direction of circular movement that plain language otherwise struggles to name.
In the direction opposite to that in which the hands of a clock move.
"Rotate the dial contraclockwise until it clicks into place."
Moving, situated, or oriented in the direction opposite to that of a clock's hands.
"A contraclockwise eddy formed where the two currents met."
Both 'contraclockwise' and 'counterclockwise' mean exactly the same thing — they just disagree about which Latin-flavored prefix to wear.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of contraclockwise
The word combines the prefix 'contra-', from Latin meaning 'against' or 'opposite', with 'clockwise', a compound of 'clock' (ultimately from medieval Latin 'clocca', 'bell') and 'wise' in its older sense of 'manner or way'. It arose as an alternative construction alongside 'counterclockwise', which uses the parallel English prefix 'counter-', itself also ultimately derived from Latin 'contra' via Old French 'contre'. Both forms emerged in the modern era once mechanical clocks made their handedness the universal reference for circular direction; the 'counter-' version became dominant, leaving 'contraclockwise' as a legitimate but minor variant.
How contraclockwise is actually used
'Contraclockwise' is a genuine but uncommon variant of 'counterclockwise', encountered chiefly in North American English; most style guides and dictionaries prefer 'counterclockwise'. It functions as an adverb when describing motion ('turn it contraclockwise') and as an adjective when describing orientation ('a contraclockwise swirl').
Easily confused with contraclockwise
Counterclockwise is the standard and far more common term for leftward circular motion; 'contraclockwise' is a rarer variant built with the prefix contra- instead of counter-, but both mean the same thing.