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word count
The word count is the number of words in a document or passage of text. Word counting may be needed when a text is required to stay within certain numbers of words. This may particularly be the case in academia, legal proceedings, journalism and advertising. Word count is commonly used by translators to determine the price for the translation job. Word counts may also be used to calculate measures of readability and to measure typing and reading speeds (usually in words per minute). When converting character counts to words, a measure of 5 or 6 characters to a word is generally used.〔The Science Fiction and Fantasy Writers of America suggest (6 chars to a word )〕
== Details and variations of definition ==
Variations in the operational definitions of how to count the words can occur (namely, what "counts as" a word, and which words "don't count" toward the total). However, especially since the advent of widespread word processing, there is a broad consensus on these operational definitions (and hence the bottom-line integer result). The consensus is to accept the text segmentation rules generally found in most word processing software (including how word boundaries are determined, which depends on how word dividers are defined). The first trait of that definition is that a space (any of various whitespace characters, such as a "regular" word space, an em space, or a tab character) is a word divider. Usually a hyphen or a slash is, too. Different word counting programs may give varying results, depending on the text segmentation rule details, and on whether words outside the main text (such as footnotes, endnotes, or hidden text) are counted. But the behavior of most major word processing applications is broadly similar.
However, during the era when school assignments were done in handwriting or with typewriters, the rules for these definitions often differed from today's consensus. Most importantly, many students were drilled on the rule that "certain words don't count", usually articles (namely, "a", "an", "the"), but sometimes also others, such as conjunctions (for example, "and", "or", "but") and some prepositions (usually "to", "of"). Hyphenated permanent compounds such as "follow-up" (noun) or "long-term" (adjective) were counted as one word. To save the time and effort of counting word-by-word, often a rule of thumb for the average number of words per line was used, such as 10 words per line. These "rules" have fallen by the wayside in the word processing era; the "word count" feature of such software (which follows the text segmentation rules mentioned earlier) is now the standard arbiter, because it is largely consistent (across documents and applications) and because it is fast, effortless, and costless (already included with the application).
As for which sections of a document "count" toward the total (such as footnotes, endnotes, abstracts, reference lists and bibliographies, tables, figure captions, hidden text), the person in charge (teacher, client) can define their choice, and users (students, workers) can simply select (or exclude) the elements accordingly, and watch the word count automatically update.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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