The following is based on current US usage (British usage of this word may be considerably different). This word is not used often in the US today (it might almost be classified as a "$5 word," that is, one that is only used by people who like to show off their vocabulary), and when it is used, it is tricky to use right. The four sentences you listed, although technically correct according to the definition of the word, would typically not be used in the US.
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Anonymousit might almost be classified as a "$5 word," that is, one that is only used by people who like to show off their vocabulary), and when it is used, it is tricky to use right.I don't find it particularly stuffy or show-offish. I probably wouldn't use while talking with a 5-year old but wouldn't hesitate to use it with any educated adult.