Meaning of “box” - Learner’s Dictionary

box

noun uk us /bɒks/
CONTAINER [ C ]
SQUARE SPACE [ C ]

A2 a small square on a page that gives you information or where you write information:

Write 'Y' in the box if you would like more details.
SMALL PLACE [ C ]

a small area of a theatre, court, etc that is separate from where other people are sitting

the box informal

the television:

What's on the box tonight?
→ See also phone box , post box , witness box

(Definition of “box noun” from the Cambridge Learner’s Dictionary © Cambridge University Press)