You searched for: “variations
variation (s) (noun), variations (pl)
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geomagnetic secular variation, secular variation (s) (noun); geomagnetic secular variations; secular variations (pl)
In geophysics, the changes in the Earth's magnetic field: Such geomagnetic secular variations occur over hundreds of years and are caused by internal changes in the Earth or a variation of any field or parameter which occurs over hundreds of years.
This entry is located in the following units: geo-, ge- + (page 14) vari- (page 1)
geomagnetic variation (s) (noun), geomagnetic variations (pl)
Any change that happens to the geomagnetic field: A geomagnetic variation can be temporal or short-time changes in the geomagnetic field, both long-term (secular) and short-term (transient).
Word Entries at Get Words: “variations
Partial changes in the form, position, state, or qualities of something; modifications; alternations; mutations; diversities; deviations.

". . . it was later realized that the phenomenon of changing air pressure had accounted for the variations in temperature readings in the open thermoscopes."

This entry is located in the following unit: Thermometer and Temperature Scales (page 1)