This is the 419th most frequent Hindi word.
आल
The Hindi word "आल" does not have a standalone meaning and may be a truncated form or part of a larger word.
In this sentence, 'आल' is used as a part of the word referring to the mango tree ('आल के पेड़').
आल के पेड़ पर बहुत फल हैं।
There are many fruits on the mango tree.
Here, 'आल' refers to the fruit mango as used generally in 'आल का मौसम' indicating the 'season for mangoes'.
गांव में आल का मौसम है।
It is the season for mangoes in the village.
In this context, 'आल' again refers to the mango tree through the possessive phrase 'आल के पत्तों' meaning 'the mango tree's leaves'.