Etymology of Medieval

here's a few YouTube channels about swords, knights, castles, etc.

• metatron https://www.youtube.com/channel/UCIjGKyrdT4Gja0VLO40RlOw
• shadiversity https://www.youtube.com/channel/UCkmMACUKpQeIxN9D9ARli1Q

The word medieval is annoying. Because it is not lucid. What does medi + eval mean? Thinking of a replacement word.

So, let's lookup etymology. Here it is.

“pertaining to or suggestive of the Middle Ages,” 1825 (mediaeval), coined in English from Latin medium “the middle” (from PIE root *medhyo- “middle”) + aevum “age” (from PIE root *aiw- “vital force, life; long life, eternity”).

[etymology of medieval https://www.etymonline.com/word/medieval]

so apparently, it just medi = mid, eval = age.

So, instead of saying medieval, we could simply say Middle Ages instead, or, say, year 400 to 1400.