Quote1. compare
2. equal
3. level, make even/straight
4. reach as high or deep as
Don Latin-Dictionary.net has these four variants under aequo. The poet in me rather likes number 4, for the 'reach' double-entendre I mentioned above.
Edit;
I had a long-suffering English professor in college who I think grew somewhat tired of my etymological leaps (reaches? ); but even he was impressed when he put me on the spot in a close reading of Milton's Paradise Lost, and I was able to furnish a connection extemporaneously between "malice" and "apple" in the scene in the Garden of Eden.
Malus is the Latin word, and still the scientific name for the "malicious" fruit.