(music theory) A tuning system in which every interval (as a ratio of frequencies) is some exactly positive integral power of some smallest, other than the unison, base interval. In particular:

Almost equally.

one twenty-fourth of a full day-night cycle (as opposed to one twelfth of a night or a day)

In a situation in which all parties have a reasonable chance of succeeding; without conferring an undue advantage to any party.

With the same set of advantages and disadvantages; on an equal footing, on a level playing field. / With respect for people's backgrounds, rights, and responsibilites; as equals.

The payment of the same amount of money to people who do the same work, irrespective of (especially) gender or race.

Alternative form of on an equal footing

To an equal extent.

(music) A chord characterized by one repeating interval.

(idiomatic) A person or position that is formally of equal rank to others in a group, but nonetheless takes a leading role within that group.