The line joining the points of contact of tangents drawn to meet a curve from a point called the pole of the line.
"In advanced geometry, the polar is defined as the straight line that connects the two points where tangent lines drawn from an external pole touch the given conic section."
In plain English: A polar is an adjective used to describe something related to either of Earth's North and South poles, though it can also refer to opposite ends or sides of anything else.
"The polar regions are covered in ice all year round."
having a pair of equal and opposite charges
"The polar molecule consists of two regions holding equal and opposite electrical charges."
characterized by opposite extremes; completely opposed
"in diametric contradiction to his claims"
"diametrical (or opposite) points of view"
"opposite meanings"
"extreme and indefensible polar positions"
located at or near or coming from the earth's poles
"polar diameter"
"polar zone"
"a polar air mass"
"Antarctica is the only polar continent"
of or existing at or near a geographical pole or within the Arctic or Antarctic Circles
"polar regions"
Of or having a pole or polarity.
"The polar regions experience extreme variations in daylight throughout the year due to their position near the Earth's poles."
In plain English: Polar means extremely different from something else, often used to describe people who are very unfriendly and cold toward others.
"The polar regions are covered in ice all year round."
Usage: Use polar as an adjective to describe things related to magnetic poles, geographic regions near Earth's North and South Poles, or items with opposite characteristics like positive and negative charges. Avoid confusing it with "pole," which is the noun referring specifically to either of these extreme points on a sphere or axis.
The word polar comes from Late Latin polāris, which was formed by combining the word for "pole" with a suffix meaning "pertaining to." It entered English directly from this source to describe anything related to one of the Earth's poles.