Summer refers to one of four seasons, traditionally the second, marked by the longest and typically hottest days of the year due to the inclination of the Earth and thermal lag. Typically regarded as being from June 21 to September 22 or 23 in parts of the USA, the months of June, July and August in the United Kingdom and the months of December, January and February in the Southern Hemisphere. It commonly describes year; used to give the age of a person, usually a young one, someone with light, pinkish skin that has a blue undertone, light hair and eyes, seen as best suited to certain colors of clothing, and a pack-horse, which gives the term a broader and more practical sense than a single short definition would suggest. Depending on context, it can also point to a horizontal beam supporting a building, a person who sums, and a machine or algorithm that sums, so the category can cover literal uses, related ideas, and more figurative extensions of the same core meaning. Taken together, these meanings present Summer as a flexible theme rather than a narrowly technical label, covering the central idea people usually mean when they use the word while still leaving room for closely related senses that appear in real language.
