mr

(especially British) Abbreviation of Mister. [A general title of respect for an adult male.]

(especially British) Abbreviation of March. [The third month of the Gregorian calendar, following February and preceding April, containing the northward equinox.]

(pharmacology, medicine) Initialism of modified release.

(cardiology) Initialism of mitral regurgitation.

Clipping of MRI (“magnetic resonance imag[e/er/ing]”).

(computing) Initialism of mixed reality. [The merging of real and virtual worlds to produce new environments and visualizations where physical and digital objects coexist and interact.]

Initialism of Master of the Rolls, as a postnominal. [The President of the Court of Appeal of England and Wales, Civil Division, and Head of Civil Justice; a judge who is second in seniority in England and Wales only to the Lord Chief Justice.]

(US military) Acronym of memorandum for the record, memorandum for record, memo for the record, or memo for record. [A US military document meant to act as an internal, formal record of a verbally or informally delivered communication.]

(software engineering) Initialism of merge request. [(programming) Synonym of pull request.]

Initialism of mortality rate.

Initialism of mental retardation, a deprecated former term for intellectual disability. [(psychology, medicine, dated, deprecated) Synonym of intellectual disability.]

Initialism of magnetic resonance

Initialism of magnetoresistance [(physics) The change of electrical resistance produced in a conductor or semiconductor on application of a magnetic field.]

(UK, rail transport) Initialism of Midland Railway.

(biochemistry) Initialism of mineralocorticoid receptor.

(prison system) Initialism of mandatory release.

(sports) Initialism of meeting record, the best performance at all occurrences of a particular athletic meeting.

Abbreviation of millirem. [One thousandth of a rem]

(education, special education) Initialism of mentally retarded. [(now potentially offensive) intellectually disabled, medically defined as having an IQ (intelligence quotient) below 70 in addition to deficits in two or more adaptive behaviors (which means having problems with basic functional skills that affect everyday, general living).]

Initialism of magnetoresistive [Of or pertaining to magnetoresistance; exhibiting magnetoresistance.]