Main Difference
The main difference between Century and Decade is that the Century is a unit of time lasting 100 years and Decade is a period of 10 years.
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Century
A century (from the Latin centum, meaning one hundred; abbreviated c.) is a period of 100 years. Centuries are numbered ordinally in English and many other languages.
A centenary is a hundredth anniversary, or a celebration of this, typically the remembrance of an event which took place a hundred years earlier.
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Decade
A decade is a period of 10 years. The word is derived (via French and Latin) from the Ancient Greek: δεκάς, translit. dekas), which means a group of ten. Other words for spans of years also come from Latin: biennium (2 years), triennium (3 years), quadrennium (4 years), lustrum (5 years), century (100 years), millennium (1000 years).
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Century (noun)
A period of 100 consecutive years; often specifically a numbered period with conventional start and end dates, e.g., the twentieth century, which stretches from (strictly) 1901 through 2000, or (informally) 1900 through 1999. The first century AD was from 1 to 100.
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Century (noun)
A unit in ancient Roman army, originally of 100 army soldiers as part of a cohort, later of more varied sizes (but typically containing 60 to 70 or 80) soldiers or other men (guards, police, firemen), commanded by a centurion.
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Century (noun)
A Centuriate Assembly.
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Century (noun)
A hundred things of the same kind; a hundred.
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Century (noun)
A hundred runs scored either by a single player in one innings, or by two players in a partnership.
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Century (noun)
A race a hundred units (as meters, kilometres, miles) in length.
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Century (noun)
A banknote in the denomination of one hundred dollars.
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Decade (noun)
A series or group of ten entities. from 16th c.
“a decade of soldiers”
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Decade (noun)
A historical period of the ten years in which the beginning year ended in “0” and the ending year ended in “9”.
“The 1960s was a turbulent decade.”
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Decade (noun)
Any given period of ten years. from 17th c.
“I haven’t seen my cousin in over a decade!”
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Decade (noun)
In the French Revolutionary calendar, a group of ten days. from 18th c.
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Decade (noun)
A series of ten beads (or the prayers associated with them) in the rosary
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Decade (noun)
The interval between any two quantities having the ratio 10 to 1.
“There are decades between 1.8 and 18, between 25 and 250 and between 0.03 and 0.003.”
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Decade (noun)
Any of the sets of ten sequential braille characters with predictable patterns.