[Answer] Which of these words is closest in meaning to ephemeral?

Step 1 : Introduction to the question "Which of these words is closest in meaning to ephemeral?"

...1. Permanent 2. Obligatory 3. Transient 4. Undeterred

Step 2 : Answer to the question "Which of these words is closest in meaning to ephemeral?"

Transient - You might think of a 'jiffy' as a generally ephemeral — or short-lived, non-permanent — measurement of time, but did you know it's an actual, measurable unit? It accounts for the time it takes for light to travel the distance of a single nucleon.:

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