Definition of Old Style in English:

Old Style

(also os)

noun

  • [mass noun] The method of calculating dates using the Julian calendar.

    • ‘The armed insurrection in Petrograd (formerly St Petersburg), the beginning of the ‘Great October Socialist Revolution’, began on 24 October, Old Style, or 6 November.’
    old style, former, past, bygone, historic, heritage, antique, antiquarian, early, classical, traditional, folk, old-world, ancestral, time-honoured, ancient, veteran, vintage, quaint
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