What does "focus" mean?
A point at which reflected or refracted rays of light converge.
noun, verb ·Very common ·Middle school level
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"The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire."
"Unfortunately, the license plate is out of focus in this image."
"During this scene, the boy’s face shifts subtly from soft focus into sharp focus."
"I believe I can bring the high degree of focus required for this important job."
"My studies are my main focus right now."
"The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground."
"Text entered at the keyboard or pasted from a clipboard is sent to the component which currently has the focus."
"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."
"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."
"You'll need to focus the microscope carefully in order to capture the full detail of this surface."
"I can't get the lens to focus."
"The president focused her remarks on the newcomers."
"If you're going to beat your competitors, you need to focus."
"I have to focus on my work."
"The text box won't receive the user's keystrokes unless you explicitly focus it."
"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."
"The environment was the focus of student council activities."
A point at which reflected or refracted rays of light converge.
Common synonyms include: center, centre, concentrate, focal point, absorbed, abstract focus.
The environment was the focus of student council activities.
Pronounced /ˈfəʊ.kəs/.
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."