An arithmetical symbol or character (0) of no value by itself, but which increases or decreases the value of other figures according to its position…

A nought; a meaningless letter or symbol; a blank (cf. null, n.1 1). Obsolete.

A nought, a zero; esp. in Typography. Obsolete.

The symbol 0, used to denote the absence of quantity; = cipher, n. 1.

Zero; a nought, a zero; (Mathematics) something equal to zero.

The figure or character 0, representing zero; = nought, pron. 4. Now chiefly U.S.

The figure or character 0, representing zero; a zero. Cf. naught, pron. 3a.

A nought, zero, cipher. Frequently in oughts and crosses n. = noughts and crosses, n. Also figurative.

A nought, zero. Cf. ought, n.2 Now chiefly regional.

The Arabic zero, 0; nought. Usually in combination with other numerals. Cf. O, n.3 1.