A sharp bend. The statistical test, and the name for it are both credited to karl pearson around the year 1900. The relation seems to be to the level or ground slipping away as you go forward. The hedros originally referred to any flat surface. Positive numbers could be set out one by one. Every multiple of four is even. Mathematically it is often used for things that are opposites in some way, as in the complex conjugates.
Common words with plural in
The relation to the center of a circle seems obvious. Please set a username for yourself.