decade [ dec·a·d·e ]
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Noun
1. A period of ten years.
Untangling this problem could take decades of research.
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2. A period of ten years beginning with a year ending in 0.
It was the early 1990s, the beginning of a decade of civil war and chaos.
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3. Each of the five divisions of each chapter of the rosary.
a local priest led the mourners in a decade of the rosary
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4. A range of electrical resistances, frequencies, or other quantities spanning from one to ten times a base value.
power per decade of frequency
Usage
1. There are two possible pronunciations for decade: one puts the stress on the dec- while the other puts the stress on the -cade (sounds like decayed). The second pronunciation is disapproved of by some traditionalists but is now regarded as a standard, acceptable alternative
Origin
1. Late Middle English (denoting each of ten parts of a literary work): via Old French and late Latin from Greek deka ‘ten’. decade (sense 1) dates from the early 17th century.

