ckd: (cpu)
blue shark of friendliness ([personal profile] ckd) wrote in [personal profile] truepenny 2009-12-31 06:46 am (UTC)

It's simply a question of cardinal vs. ordinal nomenclature. Centuries are usually ordinal (20th, 21st) though sometimes cardinal (1700s, 1800s); decades seem to be almost universally cardinal (1980s, 1990s).

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