There are 2 definitions of Old Style in English:

Old Style1

Line breaks: Old Style
(abbreviation: OS)

noun

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

Definition of Old Style in:

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Word of the day apposite
Pronunciation: ˈapəzɪt
adjective
apt in the circumstances or relation to something

There are 2 definitions of Old Style in English:

old style2

Syllabification: old style

Entry from US English dictionary

noun

1A style that is no longer current, common, or fashionable: the old style of gabled manor
1.1 Printing An early style of type characterized by strokes of relatively equal thickness and the use of serifs, often slanted.

adjective

[attributive] Back to top  
Denoting or according to a style that is no longer current: old-style farmers urban centers of old-style manufacturing

Definition of Old Style in: