As noun, often loosely used in perfunctory writing about fashions, music, painting, and other arts: "an Oriental effect;" "effects in pale green;" "very delicate effects;" "broad effects;" "subtle effects;" "a charming effect was produced by." The writer who has a definite meaning to express will not take refuge in such vagueness.
Etc. Not to be used of persons. Equivalent to and the rest, and so forth, and hence not to be used if one of these would be insufficient, that is, if the reader would be left in doubt as to any important particulars. Least open to objection when it represents the last terms of a list already given in full, or immaterial words at the end of a quotation.
At the end of a list introduced by such as, for example, or any similar expression, etc. is incorrect.
Fact. Use this word only of matters of a kind capable of direct verification, not of matters of judgment. That a particular event happened on a given date, that lead melts at a certain temperature, are facts. But such conclusions as that Napoleon was the greatest of modern generals, or that the climate of California is delightful, however incontestable they may be, are not properly facts.
On the formula the fact that, see under Rule 13.
Factor. A hackneyed word; the expressions of which it forms part can usually be replaced by something more direct and idiomatic.