leading

The activity of leading.

Thin strip of metal used to separate lines of type in printing.

Indicating the most important performer or role.

“the leading man”

Having the leading position or higher score in a contest.

“the leading team in the pennant race”

Greatest in importance or degree or significance or achievement.

“the country's leading poet”

Going or proceeding or going in advance; showing the way.

“we rode in the leading car”

“the leading edge of technology”