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I do not like the type of definions as found here (expression) and elsewhere.
"Expression is the act of expressing something" is tautological, or at least not educative, because expression is a noun formed from the verb to express, something you would have guessed yourself. Now if you do not happen to know what the verb express mean (apart from disambiguation) your are lost immediately. Always think of non-native speaking users (of the English language) who cannot learn anything from such phrasing. Further examples inclue:
journalist: "A journalist is a person who engages in journalism" - so what is a journal, to start with? If you see this point, you may also consider the idea that in coming to any page of wikipedia with the purpose of learning both content and the language, an introductiory passage on what words you should be familair with before you start reading the one you have just hit could be just as handy as the existing links to further reading and forking at the end of an article.
Apogr 06:00, 27 Aug 2004 (UTC)
I think expression can be used as a synonym for exocytosis or secretion, as in the term "constitutive expression" - but I'm just a dilettante.
D021317c 09:40, 13 December 2005 (UTC)