Concept:
A synonym is a word that has the same or nearly the same meaning as another word. To answer synonym-based questions correctly, we must understand the exact meaning of the given word and compare it carefully with each option.
Step 1: Understand the meaning of the word "eternal".
The word eternal refers to something that has no beginning or end, or something that continues forever without stopping. It is often used to describe things that are permanent, everlasting, and timeless.
Examples:
• The beauty of nature is eternal.
• People remember the eternal contributions of great leaders.
Step 2: Examine each option carefully.
• Everlasting: Continuing forever or for an unlimited period of time.
• Temporary: Existing only for a short duration.
• Transitory: Lasting only briefly; not permanent.
• Terminable: Capable of being ended or stopped.
Step 3: Identify the correct synonym.
The meaning of everlasting is almost identical to the meaning of eternal. The remaining options indicate something that can end, which is the opposite of eternal.
Therefore, the correct answer is:
\[
\boxed{\text{Everlasting}}
\]