This is the 58th most frequent Hindi word.
आय
Income.
Here, 'आय' denotes 'income,' which is the earning or revenue of an individual.
उसकी आय बहुत अधिक है।
His income is very high.
In this context, 'आय' refers to 'accrual' or gaining, here specifically of knowledge.
पुस्तक पढ़ने से ज्ञान की आय होती है।
Reading books accrues knowledge.
Here, 'आय' is related to the attendance or gathering amount in an event or occasion.