From BiblePortal Wikipedia

King James Dictionary [1]

Excel', L. excello, the root of which, cello, is not in use.

1. To go beyond to exceed to surpass in good qualities or laudable deeds to outdo.

Excelling others, these were great

Thou greater still, must these excel.

Many daughters have done virtuously, but

thou excellest them all.  Proverbs 31

2. To exceed or go beyond in bad qualities or deeds. 3. To exceed to surpass.

Excel', To have good qualities, or to perform meritorious actions, in an unusual degree to be eminent, illustrious or distinguished.

Bless the Lord, ye his angels, that excel in strength.  Psalms 103

We say, to excel in mathematics to excel in painting to excel in heroic achievements.

Webster's Dictionary [2]

(1): ( v. t.) To exceed or go beyond; to surpass.

(2): ( v. t.) To go beyond or surpass in good qualities or laudable deeds; to outdo or outgo, in a good sense.

(3): ( v. i.) To surpass others in good qualities, laudable actions, or acquirements; to be distinguished by superiority; as, to excel in mathematics, or classics.