Princeton's WordNet

1. focus, focusing, focussing, focal point, direction, centering(noun)

   the concentration of attention or energy on something

   "the focus of activity shifted to molecular biology"; "he had no direction in his life"

2. focus(noun)

   maximum clarity or distinctness of an image rendered by an optical system

   "in focus"; "out of focus"

3. focus(noun)

   maximum clarity or distinctness of an idea

   "the controversy brought clearly into focus an important difference of opinion"

4. focus, focal point, nidus(noun)

   a central point or locus of an infection in an organism

   "the focus of infection"

5. stress, focus(noun)

   special emphasis attached to something

   "the stress was more on accuracy than on speed"

6. focus, focal point(noun)

   a point of convergence of light (or other radiation) or a point from which it diverges

7. focus(verb)

   a fixed reference point on the concave side of a conic section

8. concentrate, focus, center, centre, pore, rivet(verb)

   direct one's attention on something

   "Please focus on your studies and not on your hobbies"

9. focus(verb)

   cause to converge on or toward a central point

   "Focus the light on this image"

10. concenter, concentre, focalize, focalise, focus(verb)

    bring into focus or alignment; to converge or cause to converge; of ideas or emotions

11. focus, focalize, focalise(verb)

    become focussed or come into focus

    "The light focused"

12. focus, focalize, focalise, sharpen(verb)

    put (an image) into focus

    "Please focus the image; we cannot enjoy the movie"

Kernerman English Learner's Dictionary

1. focus(noun)ˈfoʊ kəs

   the person or thing receiving most attention

   Changes to management will be the focus of our meeting.

2. focusˈfoʊ kəs

   attention or emphasis that is given to sth

   The focus will be on controlling the spread of the disease.

3. focusˈfoʊ kəs

   (of a photograph or film) looking clear/not clear

   None of the pictures were in focus.

4. focus(verb)ˈfoʊ kəs

   to concentrate or give attention to

   Focus your attention on what is important.; Let's focus on the first paragraph.

5. focusˈfoʊ kəs

   to look at sth until you can see it clearly

   I couldn't focus my eyes.; Focus on the smallest letters.

6. focusˈfoʊ kəs

   to move part of a camera so that sth can be seen clearly through it

   Focus on the faces.

Wiktionary

1. focus(Noun)

   a point at which reflected or refracted rays of light converge.

   The heat of sunlight at the focus of a magnifying glass can easily set dry leaves on fire.

2. focus(Noun)

   a point of a conic at which rays reflected from a curve or surface converge.

3. focus(Noun)

   The fact of the convergence of light on the photographic medium.

   Unfortunately, the license plate is out of focus in this image.

4. focus(Noun)

   The quality of the convergence of light on the photographic medium.

   During this scene, the boyu2019s face shifts subtly from soft focus into sharp focus.

5. focus(Noun)

   concentration of attention.

   I believe I can bring the high degree of focus required for this important job.

6. focus(Noun)

   the exact point of where an earthquake occurs, in three dimensions.

   The earthquake's focus was at exactly 37 degrees north, 18 degrees south, seventy five meters below the ground.

7. focus(Noun)

   The indicator of the currently active element in a user interface.

   Text entered at the keyboard or pasted from a clipboard is sent to the component which currently has the focus.

8. focus(Noun)

   The most important word or phrase in a sentence or passage, or the one that imparts information

9. focus(Verb)

   To cause (rays of light, etc) to converge at a single point.

10. focus(Verb)

    To adjust (a lens, an optical instrument) in order to position an image with respect to the focal plane.

    You'll need to focus the microscope carefully in order to capture the full detail of this surface.

11. focus(Verb)

    To concentrate one's attention.

    Focus on passing the test.

12. focus(Verb)

    To make (a liquid) less diluted.

13. focus(Verb)

    To concentrate oneu2019s attention.

    If you're going to beat your competitors, you need to focus.

Origin: focus, of unknown origin.

Webster Dictionary

1. Focus(noun)

   a point in which the rays of light meet, after being reflected or refrcted, and at which the image is formed; as, the focus of a lens or mirror

2. Focus(noun)

   a point so related to a conic section and certain straight line called the directrix that the ratio of the distace between any point of the curve and the focus to the distance of the same point from the directrix is constant

3. Focus(noun)

   a central point; a point of concentration

4. Focus(verb)

   to bring to a focus; to focalize; as, to focus a camera

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