focus

IPA: fˈoʊkʌs

(countable, optics) A point at which reflected or refracted rays of light converge.
(countable, geometry) A point of a conic at which rays reflected from a curve or surface converge.
(uncountable, photography, cinematography) The fact of the convergence of light on the photographic medium.
(uncountable, photography, cinematography) The quality of the convergence of light on the photographic medium.
(uncountable) Concentration of attention.
(countable) Something to which activity, attention or interest is primarily directed.
(countable, seismology) The exact point of where an earthquake occurs, in three dimensions (underneath the epicentre).
(graphical user interface) The status of being the currently active element in a user interface, often indicated by a visual highlight.
(linguistics) The most important word or phrase in a sentence or passage, or the one that imparts information.
An object used in casting a magic spell.

(transitive) To cause (rays of light, etc) to converge at a single point.
(transitive, optics) To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
(intransitive, optics, of a lens, optical instrument, etc.) To adjust itself or be adjusted such that light from a scene converges appropriately to create a clear image.
(transitive) To direct attention, effort, or energy to a particular audience or task.
(intransitive) To concentrate one’s attention.
(intransitive, followed by on or upon) To concentrate one's attention on something; to have as one's central point of interest, concern, etc.
(computing, graphical user interface, transitive) To transfer the input focus to (a visual element), so that it receives subsequent input.
(accounting, formerly) To aggregate figures of accounts.

Examples of "focus" in Sentences