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2. Antipodal point - Wikipedia

   en.wikipedia.org/wiki/Antipodal_point

   The two points P and P ' (red) are antipodal because they are ends of a diameter PP ', a segment of the axis a (purple) passing through the sphere's center O (black). P and P ' are the poles of a great circle g (green) whose points are equidistant from each (with a central right angle).

3. Antipodes - Wikipedia

   en.wikipedia.org/wiki/Antipodes

   In geography, the antipode (/ ˈ æ n t ɪ ˌ p oʊ d, æ n ˈ t ɪ p ə d i /) of any spot on Earth is the point on Earth's surface diametrically opposite to it. A pair of points antipodal (/ æ n ˈ t ɪ p ə d əl /) to each other are situated such that a straight line connecting the two would pass through Earth's center.

4. English grammar - Wikipedia

   en.wikipedia.org/wiki/English_grammar

   The first published English grammar was a Pamphlet for Grammar of 1586, written by William Bullokar with the stated goal of demonstrating that English was just as rule-based as Latin. Bullokar's grammar was faithfully modeled on William Lily's Latin grammar, Rudimenta Grammatices (1534), used in English schools at that time, having been ...

5. List of English homographs - Wikipedia

   en.wikipedia.org/wiki/List_of_English_homographs

   Most of the pairs listed below are closely related: for example, "absent" as a noun meaning "missing", and as a verb meaning "to make oneself missing". There are also many cases in which homographs are of an entirely separate origin, or whose meanings have diverged to the point that present-day speakers have little historical understanding: for ...

6. Diameter - Wikipedia

   en.wikipedia.org/wiki/Diameter

   However, they are special cases of a more general definition that is valid for any kind of -dimensional object, or a set of scattered points. The diameter of a set is the least upper bound of the set of all distances between pairs of points in the subset.

7. Unpaired word - Wikipedia

   en.wikipedia.org/wiki/Unpaired_word

   An unpaired word is one that, according to the usual rules of the language, would appear to have a related word but does not. [1] Such words usually have a prefix or suffix that would imply that there is an antonym, with the prefix or suffix being absent or opposite.

8. Opposite - Wikipedia

   en.wikipedia.org/wiki/Opposite

   A member of a pair of opposites can generally be determined by the question What is the opposite of X ? The term antonym (and the related antonymy) is commonly taken to be synonymous with opposite, but antonym also has other more restricted meanings. Graded (or gradable) antonyms are word pairs whose meanings are opposite and which lie on a ...

9. Dichromatic symmetry - Wikipedia

   en.wikipedia.org/wiki/Dichromatic_symmetry

   Dichromatic symmetry, [1] also referred to as antisymmetry, [2] [3] black-and-white symmetry, [4] magnetic symmetry, [5] counterchange symmetry [6] or dichroic symmetry, [7] is a symmetry operation which reverses an object to its opposite. [8] A more precise definition is "operations of antisymmetry transform objects possessing two possible ...