This is the 73rd most frequent Marathi word.
आ
The Marathi word "आ" means "come" (imperative form).
In this sentence, 'आ' is used as part of the word 'आंबा' (mango). It is simply a phoneme within the proper noun and doesn't hold independent meaning.
आंबा खूप गोड आहे.
The mango is very sweet.
Here, 'आ' starts the word 'आशीर्वाद' (blessing). It serves as a prefix and contributes to the meaning of the word, but does not independently stand alone.
आशीर्वाद देणे हा संस्काराचा भाग आहे.
Giving blessings is part of the culture.
In this context, 'आ' is a prefix to the root verb 'आलास,' forming a question and denoting an action.