to rouse someone to notice something, to cause someone to focus on something.
To concentrate one’s attention.
To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.
To transfer the input focus to (a visual element), so that it receives subsequent input.
To direct attention, effort, or energy to a particular audience or task.
To concentrate during a task.
To cause (rays of light, etc) to converge at a single point.
To aggregate figures of accounts.
The fact of the convergence of light on the photographic medium.
A point of a conic at which rays reflected from a curve or surface converge.
The most important word or phrase in a sentence or passage, or the one that imparts information.
The quality of the convergence of light on the photographic medium.
A point at which reflected or refracted rays of light converge.
The exact point of where an earthquake occurs, in three dimensions (underneath the epicentre).
The status of being the currently active element in a user interface, often indicated by a visual highlight.
Concentration of attention.
An object used in casting a magic spell.