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Focus

//ˈfəʊ.kəs// noun, verb

Definitions

Noun

1
A point at which reflected or refracted rays of light converge. countable
"The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire."
2
maximum clarity or distinctness of an image rendered by an optical system wordnet
3
A point of a conic at which rays reflected from a curve or surface converge. countable
4
maximum clarity or distinctness of an idea wordnet
5
The fact of the convergence of light on the photographic medium. uncountable
"Unfortunately, the license plate is out of focus in this image."

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6
the concentration of attention or energy on something wordnet
7
The quality of the convergence of light on the photographic medium. uncountable
"During this scene, the boy’s face shifts subtly from soft focus into sharp focus."
8
a fixed reference point on the concave side of a conic section wordnet
9
Concentration of attention. uncountable
"I believe I can bring the high degree of focus required for this important job."
10
a point of convergence of light (or other radiation) or a point from which it diverges wordnet
11
Something to which activity, attention or interest is primarily directed. countable
"My studies are my main focus right now."
12
a central point or locus of an infection in an organism wordnet
13
The exact point of where an earthquake occurs, in three dimensions (underneath the epicentre). countable
"The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground."
14
special emphasis attached to something wordnet
15
The status of being the currently active element in a user interface, often indicated by a visual highlight. countable, uncountable
"Text entered at the keyboard or pasted from a clipboard is sent to the component which currently has the focus."
16
The most important word or phrase in a sentence or passage, or the one that imparts information. countable, uncountable
17
An object used in casting a magic spell. countable, uncountable
"Candles, in fact, are an essential ingredient in many spells. They can be used as either the focus of the spell or as a component that sets the spell's overall mood and tone."
18
The centre of an older fish's scale, which is the point where a younger fish's scale starts to grow from. countable, uncountable

Verb

1
To cause (rays of light, etc) to converge at a single point. transitive
"The difficulties of focussing colour-light signals on curved tracks to ensure maximum sighting distance were underlined in the recent official report [...] on a low-speed collision at Newcastle Central on July 25, 1960, between an unfitted freight and a diesel-hauled passenger train."
2
put (an image) into focus wordnet
3
To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane. transitive
"You'll need to focus the microscope carefully in order to capture the full detail of this surface."
4
become focussed or come into focus wordnet
5
To adjust itself or be adjusted such that light from a scene converges appropriately to create a clear image. intransitive, usually
"I can't get the lens to focus."

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6
direct one's attention on something wordnet
7
To direct attention, effort, or energy to a particular audience or task. transitive
"The president focused her remarks on the newcomers."
8
bring into focus or alignment; to converge or cause to converge; of ideas or emotions wordnet
9
To concentrate one’s attention. intransitive
"If you're going to beat your competitors, you need to focus."
10
cause to converge on or toward a central point wordnet
11
To concentrate one's attention on something; to have as one's central point of interest, concern, etc. intransitive
"I have to focus on my work."
12
To transfer the input focus to (a visual element), so that it receives subsequent input. transitive
"The text box won't receive the user's keystrokes unless you explicitly focus it."
13
To aggregate figures of accounts.
"Whole pages of it are filled with masses of figures, generally single numbers added up in batches, and then the totals added in batches again, as though he were "focusing" some account, as the auditors put it."

Etymology

Etymology 1

Borrowed from Latin focus (“hearth, fireplace”); see there for more. Related to fuel. Kepler introduced the term into mathematics and the sciences in describing elliptical orbits of planets (quote from Nicholas Mee) : "One of the interesting properties of an ellipse is that if there were a light bulb at one focus, then all the light that it emits would reflect off the ellipse and converge at the other focus. This is why Kepler originally used the name focus for these points."

Etymology 2

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