This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. Plural form of caste.

"So much so, to give you one example, that in the great province of Madras, when the Montagu report was put into operation, it was thought necessary to protect the other Hindu castes from the monopoly which the Brahmins might otherwise secure, and so they actually enacted that 28 seats in the Madras legislature must be filled by Hindu members who were not Brahmins."

castees    castes   

animal group    social class    stratum    socio-economic class    class    position    status   

to lose caste    caste production   

Kshatriya    Brahmin    Vaishya    varna    Shudra   

Nast    aghast    amassed    asked    ast    bast    blast    cast    classed    contrast   

aristocracy    monarchy    nationality    clan    creed    sect    despotism    slavery    class    institution