having no part higher than another; having a flat or even surface.

being in a plane parallel to the plane of the horizon; horizontal.

equal, as one thing with another or two or more things with one another.

even, equable, or uniform.

filled to a height even with the rim of a container

a level teaspoon of salt.

mentally well-balanced; sensible; rational

to keep a level head in a crisis.

a device used for determining or adjusting something to a horizontal surface.

Surveying .

Also called surveyor's level. an instrument for observing levels, having a sighting device, usually telescopic, and capable of being made precisely horizontal.

an observation made with this instrument.

spirit level.

an imaginary line or surface everywhere at right angles to the plumb line.

the horizontal line or plane in which anything is situated, with regard to its elevation.

a horizontal position or condition.

an extent of land approximately horizontal and unbroken by irregularities.

a level or flat surface.

a position with respect to a given or specified height

The water rose to a level of 30 feet.

a position or plane in a graded scale of values; status; rank

His acting was on the level of an amateur. They associated only with those on their own economic level.

an extent, measure, or degree of intensity, achievement, etc.

a high level of sound; an average level of writing skill.

Linguistics . a major subdivision of linguistic structure, as phonology, morphology, or syntax, often viewed as hierarchically ordered. Compare component ( def. 6a ) , stratum ( def. 8 ) .

Mining . the interconnected horizontal mine workings at a particular elevation or depth

There had been a cave-in on the 1500-foot level.

to make (a surface) level, even, or flat

to level ground before building.

to raise or lower to a particular level or position; to make horizontal.

to bring (something) to the level of the ground

They leveled the trees to make way for the new highway.

Informal . to knock down (a person)

He leveled his opponent with one blow.

to make equal, as in status or condition.

to make even or uniform, as coloring.

Historical Linguistics . (of the alternative forms of a paradigm) to reduce in number or regularize

Old English him dative and hine accusative have been leveled to Modern English him.

to aim or point (a weapon, criticism, etc.) at a mark or objective

He leveled his criticism at the college as a whole.

Surveying . to find the relative elevation of different points in (land), as with a level.

to bring things or persons to a common level.

to aim a weapon, criticism, etc., at a mark or objective.

Surveying .

to take a level.

to use a leveling instrument.

to speak truthfully and openly (often fol. by with )

You're not leveling with me about your trip to Chicago.

Obsolete . to direct the mind, purpose, etc., at something.

Obsolete . in a level, direct, or even way or line. ?

level off,

Aeronautics . to maintain a constant altitude after a climb or descent.

to become stable; reach a constant or limit.

to make even or smooth. ?

find one's or one's own level

to attain the place or position merited by one's abilities or achievements

He finally found his level as one of the directors of the firm.

one's level best

one's very best; one's utmost

We tried our level best to get here on time.

on the level

Informal . honest; sincere; reliable

Is this information on the level?