Abbreviation of Missus or Mistress (“used before an adult woman's name or surname, used for any high-status woman without regard to marital status until the 1800s, after which it began to be reserved for married, divorced and widowed women and used with their married surnames”)

a title used for a married couple before the surname or before the name of the husband.

(UK) Alternative form of Mr. and Mrs.

(UK) Alternative form of Mr. and Mrs.

Alternative form of Mr. and Mrs.

US and Canada standard form of Mrs.

Initialism of Materials Research Society. / Initialism of Melbourne Rectangular Stadium.

Initialism of magnetic resonance spectroscopy. / Initialism of mandibular repositioning splint. / Initialism of marginal rate of substitution. / Initialism of metabolic risk score.

Britain standard form of Mr.. Abbreviation of mister. / Britain standard form of Mr.. Abbreviation of March.

(US, Canada) Abbreviation of mister. A title used before the surname in theory, though not generally in practice, above some undefined social level, too old to be addressed as “Master”, not a knight or of some higher rank, and, in Britain though not in the United States, not entitled to be addressed as “Dr.”.