How do you spell Ephemeral

Available Definitions:
1)  a. - Beginning and ending in a day; existing only, or no longer than, a day; diurnal; as, an ephemeral flower.
2)  a. - Short-lived; existing or continuing for a short time only.
3)  n. - Anything lasting but a day, or a brief time; an ephemeral plant, insect, etc.