Usage 1: "Ephemeral" is still marginally used in the original sense referring to insects that live for only a day and diseases such as an ephemeral fever or the ephemeral ague "bad hair day" which last a day but less than a nychthemeron (or "nichthy").
Suggested usage: The basic use of the word is to refer to events of exceedingly short duration: "An ephemeral smile jostled her lips at his joke; then her attention quickly returned to the filet." Because of the beauty of the word itself, it usually refers to pleasant things: "Her ephemeral romance with the president left her even lonelier and more famous." However, "His ephemeral salary was not enough to make ends meet," also works.
Etymology: Greek ephemeros "lasting a day, daily" from epi- "on" + hemera "day." (Our thanks to Chris Cowles for suggesting this lilting fixture of the English vocabulary.)
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