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”)

(UK) Alternative form of Mr. and Mrs.

(UK) Alternative form of Mr. and Mrs.

Alternative form of Mr. and Mrs.

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

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.

(education, special education) Initialism of mentally retarded.