Plain English Meaning
Seeing with both eyes at the same time so the brain can judge how far away things are.
Full Definition
Vision in which both eyes work together to view a single scene, with the brain combining the two slightly different images into one. This combined input provides depth perception and accurate judgment of distance.
Context Anchor
Seen in night vision discussions, especially when learning how pilots judge distance and depth in low light.
Derivation
From Latin 'bini' meaning 'two at a time' and 'oculus' meaning 'eye'. The word literally means 'two-eyed', which is exactly what it describes — using both eyes together.
Why Pilots Care
Accurate depth perception during night landings and obstacle avoidance depends on binocular vision, which weakens when light is low or when one eye dominates.