<p><strong>Noun</strong></p><ul><li>Also vernier scale.</li><li>A small, movable, graduated scale running parallel to the fixed graduated scale of a sextant, theodolite, barometer, etc., and used for measuring a fractional part of one of the divisions of the fixed scale.</li><li>In machinery, an auxiliary device for giving a piece of apparatus a higher adjustment accuracy.</li></ul><p><strong>Adjective</strong></p><ul><li>Equipped with a vernier: a vernier barometer.</li></ul>