Ardor is intense enthusiasm or passion for something. When you pursue a goal with ardor, you bring fierce energy and devotion to it. A student might study ancient Egypt with such ardor that she reads every book in the library on the subject, builds model pyramids, and teaches herself to read hieroglyphics. An athlete training with ardor shows up for practice and throws themselves into every drill, constantly working to improve.

The word suggests deep, burning commitment. Ardor is that burning feeling when you care so deeply about something that you can barely contain your excitement. A musician practicing scales with ardor is completely absorbed, determined to master their instrument.

You'll often see ardor paired with words like “youthful ardor” or “revolutionary ardor” because this kind of fiery passion can drive people to attempt difficult or ambitious things. The ardor of the Wright brothers helped them persist through countless failed experiments before achieving flight. Ardor is what keeps you working when others have given up, fueled by genuine love for what you're doing.