What does binocularly mean?
'Binocularly' is an adverb meaning in a manner involving both eyes used together, whether describing natural binocular vision or observation through binoculars. It derives from 'binocular', a term built on Latin roots meaning 'two eyes'. The word belongs chiefly to scientific registers — vision research, zoology, optometry — where writers describe how animals fixate on objects, how humans perceive depth, or how observers scan distant scenes. Because the two eyes receive slightly different images that the brain fuses into a single three-dimensional view, acting binocularly is central to stereopsis, our sense of depth. Its natural opposite is 'monocularly', meaning with one eye alone. Though uncommon in casual speech, where people simply say they looked through binoculars, the adverb offers precision when the emphasis falls on the two-eyed manner of seeing rather than the instrument itself.
adverbIn a manner relating to, using, or perceived by both eyes together; with the aid of binocular vision or binoculars.
- With both eyes working together, as in binocular vision.
- By means of, or through, binoculars.
"The owl fixed its prey binocularly before swooping down from the branch."
"Primates judge depth binocularly, combining the slightly different views from each eye."
"She scanned the shoreline binocularly, searching for the lighthouse through the morning haze."
Your brain merges two flat retinal images into one three-dimensional world — and 'binocularly' is the word for that everyday miracle.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of binocularly
'Binocularly' is formed from 'binocular' plus the adverbial suffix '-ly'. 'Binocular' itself comes from the Latin 'bini' (meaning 'two at a time') combined with 'oculus' ('eye'), and entered English usage in the early 18th century in connection with optical instruments such as the binocular telescope and later the field glasses we now call binoculars. Related terms sharing the same root include 'monocular' (one eye) and 'ocular' (relating to the eye).
Related word forms
How binocularly is actually used
A technical adverb found mainly in scientific writing on vision, zoology, and optics. It is rare in everyday conversation; speakers are more likely to say they looked at something 'through binoculars'.
Easily confused with binocularly
'Monocularly' describes something done with one eye only, whereas 'binocularly' refers to using both eyes together.