Bearing is an English word with several distinct but related meanings in navigation, engineering, behaviour, and speech. In general it denotes orientation, support, or influence: a navigational angle that shows direction; a machine element that supports moving parts; a person’s manner of carrying themselves; or the relevance of one fact to another. Each sense is widely used in technical and everyday language.

In navigation and surveying, a bearing is an angular measurement that describes the direction from an observer to a target relative to a reference direction. Common references are true north (geographic north) or magnetic north; bearings are usually expressed as degrees clockwise from the reference (for example, 0°/360° = north, 90° = east). Variants include true bearing, magnetic bearing, and relative bearing. Bearings are fundamental to piloting, marine and aerial navigation, and land surveying because they allow positions and courses to be plotted and communicated precisely. For further technical details see navigational bearing.

Mechanical bearing

In mechanics, a bearing is a device that permits controlled motion between two parts while supporting loads and reducing friction. Common types include:

  • Plain (journal) bearings, which use sliding contact.
  • Rolling-element bearings, such as ball and roller bearings, which use rolling elements to lower friction.
  • Thrust bearings designed to handle axial loads.
  • Fluid-film and magnetic bearings that use a film of liquid or magnetic fields to separate moving surfaces.

Bearings are essential in engines, gearboxes, wheels, turbines and many other machines. Proper selection, lubrication, and maintenance are key to reliable operation. See a general overview at mechanical bearing.

Posture, relevance, and figurative uses

The word also appears in common speech with non-technical meanings. A person’s bearing refers to their posture, carriage or manner—e.g., "She walks with a confident bearing." In reasoning and discussion, bearing denotes relevance or relation: "That evidence has no bearing on the case." These senses preserve the core idea of direction or influence.

History and distinguishing notes

Etymologically, "bearing" is derived from the verb "to bear" (to carry, support or carry on), and it entered English with senses connected to carrying, direction and support. When encountering the term, context is the clearest guide: in technical contexts it usually refers to navigation or machinery; in social and verbal contexts it relates to demeanour or relevance. Bear in mind the same word can appear in compound technical names (e.g., "bearing housing" or "bearing angle") that specify the particular application.

Because the meanings are distinct, dictionaries and technical references use the surrounding field to disambiguate them. For practical purposes: use navigational bearings when specifying direction, mechanical bearings when describing components that carry loads, and the social or argumentative senses when talking about manners or relevance.