focus's

fo·cus

F f

Definitions of focus's word

noun plural focus's a central point, as of attraction, attention, or activity: The need to prevent a nuclear war became the focus of all diplomatic efforts. 1
noun plural focus's Physics. a point at which rays of light, heat, or other radiation meet after being refracted or reflected. 1
noun plural focus's Optics. the focal point of a lens, on which rays converge or from which they deviate. the focal length of a lens; the distance from a focal point to a corresponding principal plane. the clear and sharply defined condition of an image. the position of a viewed object or the adjustment of an optical device necessary to produce a clear image: in focus; out of focus. 1
noun plural focus's Geometry. (of a conic section) a point having the property that the distances from any point on a curve to it and to a fixed line have a constant ratio for all points on the curve. 1
noun plural focus's Geology. the point of origin of an earthquake. 1
noun plural focus's Pathology. the primary center from which a disease develops or in which it localizes. 1

before 1635

One of the 43% oldest English words

1635-45; < Latin: fireplace, hearth

noun

adjective

verb

adverb

pronoun

preposition

conjunction

determiner

exclamation

A common word. It’s meaning is known to most children of preschool age. About 97% of English native speakers know the meaning and use the word.

Most Europeans know this English word. The frequency of it’s usage is somewhere between "mom" and "screwdriver".