English uses “light” for two different ideas, and Latin had a root for each. luc (also lum) is light you see: to illuminate is to light up. lev is light you lift, the opposite of heavy: a lever lifts, and to elevate is to raise. And the opposite of lev is grav, “heavy”: gravity pulls heavy things down.
Key idea
luc, lum = light (brightness). lev = light (not heavy), raise. grav = heavy, serious.
The luc words are about making things clear, as if a light were turned on: lucid writing is clear, and to elucidate is to bring out into the light. The lev and grav words are about weight: to alleviate is to make a burden lighter, and to aggravate is to make it heavier.
The parts and their words
Words taken apart
| Word and meaning | Parts, and what they say |
|---|---|
| lucid clear and easy to understand | luc light + -id → “full of light (clear)” |
| elucidate to make clear; to explain | e- out + lucid light, clear + -ate → “bring out into the light” |
| translucent letting some light pass through | trans- through + luc light + -ent → “letting light through” |
| alleviate to make pain or trouble easier to bear | al- to + lev light + -iate → “make light” |
| levity lightness of manner, especially at a serious time | lev light + -ity → “lightness” |
| elevate to lift up | e- up, out + lev raise + -ate → “raise up” |
| aggravate to make worse; also, to annoy | ag- to + grav heavy + -ate → “make heavier” |
| gravity the force that pulls things toward the earth; also, seriousness | grav heavy + -ity → “heaviness” |
Worked example: Use the parts
At the serious ceremony, the clown’s levity seemed out of place. What does levity mean?
- Take it apart: lev (light, not heavy) + -ity (the quality of).
- Literally: “lightness.” Here it means a light, joking manner.
- The sentence fits: joking at a serious event. Its opposite is gravity (seriousness).
Answer: Lightness of manner, especially at a serious time.
Meet the words
Common mistake
Confusing the two “lights.” luc is about brightness (lucid, elucidate: clear, made clear). lev is about weight (levity, alleviate: lightness, making lighter). Lucid writing is clear, not lightweight.