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Words that belong to a particular formal language are sometimes called well-formed words or well-formed formulas. A formal language is often defined by means of a formal grammar such as a regular grammar or context-free grammar, which consists of its formation rules.
A formal grammar describes which strings from an alphabet of a formal language are valid according to the language's syntax. A grammar does not describe the meaning of the strings or what can be done with them in whatever context—only their form. A formal grammar is defined as a set of production rules for such strings in a formal language.
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
Rudolph Carnap defined the meaning of the adjective formal in 1934 as follows: "A theory, a rule, a definition, or the like is to be called formal when no reference is made in it either to the meaning of the symbols (for example, the words) or to the sense of the expressions (e.g. the sentences), but simply and solely to the kinds and order of the symbols from which the expressions are ...
In formal language theory, a context-free grammar (CFG) is a formal grammar whose production rules can be applied to a nonterminal symbol regardless of its context. In particular, in a context-free grammar, each production rule is of the form
A aggravate – Some have argued that this word should not be used in the sense of "to annoy" or "to oppress", but only to mean "to make worse". According to AHDI, the use of "aggravate" as "annoy" occurs in English as far back as the 17th century. In Latin, from which the word was borrowed, both meanings were used. Sixty-eight percent of AHD4's usage panel approves of its use in "It's the ...
English adjectives, as with other word classes, cannot in general be identified as such by their form, [24] although many of them are formed from nouns or other words by the addition of a suffix, such as -al (habitual), -ful (blissful), -ic (atomic), -ish (impish, youngish), -ous (hazardous), etc.; or from other adjectives using a prefix ...
In sociolinguistics, a register is a variety of language used for a particular purpose or particular communicative situation. For example, when speaking officially or in a public setting, an English speaker may be more likely to follow prescriptive norms for formal usage than in a casual setting, for example, by pronouncing words ending in -ing with a velar nasal instead of an alveolar nasal ...