Attitude and aptitude words that were derived from the same source word are an example of a doublet?

You are absolutely correct! Attitude and aptitude are indeed a prime example of doublets.

Here's why:

* Doublets are words in English that share the same origin (etymologically) but have evolved differently in meaning and spelling.

* Both "attitude" and "aptitude" stem from the Latin word "aptitudo," meaning "fitness" or "suitability."

Over time, the two words diverged:

* Attitude came to refer to a mental position or disposition towards something.

* Aptitude retained a sense of natural ability or suitability for a specific task or role.

Therefore, the shared origin of "aptitudo" makes "attitude" and "aptitude" a doublet pair.