Meaning of “reading” - Learner’s Dictionary

reading

noun uk us /ˈriːdɪŋ/
ACTIVITY [ U ]

A1 the activity or skill of reading books:

I did a lot of reading on holiday.
EVENT [ C ]

an event at which someone reads something to an audience:

a poetry reading
MEASUREMENT [ C ]

the measurement that is shown on a piece of measuring equipment:

It's best to take a meter reading as soon as you move in.

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