evenly

from The Century Dictionary.

• With an even, level, or smooth surface; without roughness, or elevations and depressions; without inequalities; uniformly: as, the field slopes evenly to the river.
• In an even or equal manner; so as to produce or possess equality of parts, proportions, force, or the like: as, to divide anything evenly in the middle; they are evenly matched.
• In an equal degree or proportion; to an equal extent; equally.
• Without inclination toward either side; equally distant from extremes; impartially; without bias or variation.
• Smoothly; straightforwardly; harmoniously.
• Straightway.

from the GNU version of the Collaborative International Dictionary of English.

• adverb With an even, level, or smooth surface; without roughness, elevations, or depression; uniformly; equally; comfortably; impartially; serenely.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• adverb So as to make flat.
• adverb In a fair manner.
• adverb mathematics In a manner that leaves no remainder.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• adverb in a level and regular way
• adverb in equal amounts or shares; in a balanced or impartial way