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Hitherto

usgb/ˌhɪðərˈtuː/Volume
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LampPro Tip 1/3
Past ReferencePlay
Use 'hitherto' to refer to a period extending into the past, up to the current point or event discussed. SlideHis hitherto spotless reputation was now under scrutiny.
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Formal TonePlay
'Hitherto' often appears in formal or academic texts rather than casual conversation. SlideThe hitherto accepted theories are now being questioned.
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Emphasis on ChangePlay
Use 'hitherto' when emphasizing a change from past to present, particularly when introducing newly discovered information. SlideThis hitherto unexplored area offers great scientific potential.