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Definition of Secular trend.

Secular trend. Definition from Medicine Dictionaries & Glossaries
Glossary of Epidemiology Terms
Changes over a long period of time, generally years or decades.
Secular trend. Definition from Society & Culture Dictionaries & Glossaries
Environmental Engineering (English ver.)
(Data Analysis) A trend existing to some characteristic or phenomena over a relatively long period of time. Secular trends represent an important underpinning to any form of analysis as once such a trend is determined, deviations or perturbations from this trend may only be temporary and, if caused by man's activities, may not be reasonably sustainable in the long term.
Secular trend. Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
The secular variation of a time series is its long-term non-periodic variation (see Decomposition of time series). Whether something is perceived as a secular variation or not depends on the available timescale: a secular variation over a time scale of centuries may be part of a periodic variation over a time scale of millions of years. Natural quantities often have both periodic and secular variations. Secular variation is sometimes called secular trend or secular drift when the emphasis is on a linear long-term trend.

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