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A letter can be formal or informal, depending on its audience and purpose. Besides being a means of communication and a store of information, letter writing has played a role in the reproduction of writing as an art throughout history. [1] Letters have been sent since antiquity and are mentioned in the Iliad. [2]
A defining vocabulary is a list of words used by lexicographers to write dictionary definitions. The underlying principle goes back to Samuel Johnson's notion that words should be defined using 'terms less abstruse than that which is to be explained', [1] and a defining vocabulary provides the lexicographer with a restricted list of high-frequency words which can be used for producing simple ...
Formal system, an abstract means of generating inferences in a formal language; Formal language, comprising the symbolic "words" or "sentences" of a formal system; Formal grammar, a grammar describing a formal language; Colloquialism, the linguistic style used for informal communication
For example, the alphabet of lowercase letters "a" through "z" can be used to form English words like "iceberg" while the alphabet of both upper and lower case letters can also be used to form proper names like "Wikipedia". A common alphabet is {0,1}, the binary alphabet, and a "00101111" is an example of a binary string.
The most general kind of form letter consists of one or more regions of boilerplate text interspersed with one or more substitution placeholders. Although form letters are generally intended for a wide audience, many form letters include stylistic elements or features intended to appear specifically tailored to the recipient.
Core vocabulary (the most common 2,000-3,000 English words) needs to be heavily stressed in language teaching. There is no point in presenting exotic vocabulary until students have mastered basic, high-frequency words. Learners should be tested on high-frequency word lists for passive knowledge, active production and listening comprehension.
Palindrome: a word or phrase that reads the same in either direction; Pangram: a sentence which uses every letter of the alphabet at least once; Tautogram: a phrase or sentence in which every word starts with the same letter; Caesar shift: moving all the letters in a word or sentence some fixed number of positions down the alphabet; Techniques ...
A word over an alphabet can be any finite sequence (i.e., string) of letters. The set of all words over an alphabet Σ is usually denoted by Σ * (using the Kleene star). The length of a word is the number of letters it is composed of. For any alphabet, there is only one word of length 0, the empty word, which is often denoted by e, ε, λ or ...