# Level

Level or levels or levelling may refer to:

## Concepts

• Water level, the average height of a water
• Sea level, the average height of the ocean's surface, reference of height systems

## Engineering-related

• Floor, or storey, of a building or a mine
• A Canal pound is called a level on American canals.
• A device used to measure true horizontal or relative heights, frequently used in surveying and construction:
• Regrading, the process of raising and/or lowering the levels of land

## Science and mathematics

• Level (algebra), the least number of squares that sum to $-1$ in a field
• Level set, a set where a function takes on a given constant value
• Level measurement, instrumentation techniques to measure height within a vessel
• Level of measurement, a theory of the kinds of scales or levels used for measuring
• Level (logarithmic quantity), a logarithmic measure defined as the logarithm of a ratio of two like quantities, often expressed in decibels
• Level, for a Categorical variable in statistics, the different values that such a variable can have
• Level, in Applied statistics, the different values that a factor can have
• Level, in the Design of experiments, the different treatments that are applied within a factor
• Classification levels, in Biological organisation, classrooms, churches, hospitals among others
• Energy levels, discrete amounts of energy that can be held by a quantum mechanical system or confined particle

## Linguistics

• ILR scale, descriptions of abilities to communicate in a language

## Other uses

• LeveL, a games magazine in the Czech Republic, Romania and Turkey
• Level (magazine), a games magazine in Sweden
• Level Vodka, a brand of vodka
• Level playing field, a concept about fairness where all play by the same set of rules
• Level Mountain, a large massif in northern British Columbia, Canada
• a collection of objects with the same rank in a hierarchy; see Overlapping hierarchy
• a layer of defense in American football; see Two-level defense
• an indication of the number of previous posts to a forum thread at which a portion of text was written