Janus word

noun

: contronym

"Deliberate speed" signals clear intent and resolution, but also a lack of haste. That makes the phrase not quite a classic "Janus word," one whose two meanings are directly opposite (sanction, for instance, meaning both to punish and to privilege).

—Ruth Walker, Christian Science Monitor, 17 July 2014

Word History

First Known Use

1986, in the meaning defined above

The Ultimate Dictionary Awaits

Expand your vocabulary and dive deeper into language with Merriam-Webster Unabridged.

1. Expanded definitions
2. Detailed etymologies
3. Advanced search tools
4. All ad-free

Discover what makes Merriam-Webster Unabridged the essential choice for true word lovers.

Start Your Free Trial Now