(algebra) An automorphism which is not an inner automorphism.

The outer part of the arm, from the shoulder to the wrist.

Used other than figuratively or idiomatically: see outer, core. / (planetology) The hot liquid material found near the centre of some planets, distinct from the solid inner core.

plural of outer class

(object-oriented programming) A class that contains an inner class.

(UK, law) The legal profession as practised by junior barristers.

One of the boroughs of New York City excluding Manhattan (the boroughs of the Bronx, Brooklyn, Queens and Staten Island).

(mathematical analysis, measure theory) A measure-like function derived from some premeasure as follows: when it is applied to a set E, it yields the infimum of the premeasures of all possible premeasurable covers of E. More abstractly, a measure-like function whose domain is the power set of some underlying set, which has the properties of (1) yielding zero when applied to the empty set, (2) being monotonic (if A is subset of B then this function applied to A is less-than-or-equal to this function applied to B), (3) being subadditive (if A is a countable sum of Bⱼ's then this function applied to A is less-than-or-equal to the sum of the applications of this function to the Bⱼ's).

The lower branch of the Scottish Court of Session.

(aviation) A type of marker beacon placed to indicate the final approach fix of an ILS or IGS approach, triggering a continuous sequence of visual and aural Morse code dashes from the marker beacon receiver in the cockpit of an aircraft flying over the marker.