level [1] (level of complexity): a specific degree of complexity of linguistic structures. The levels that are most commonly mentioned can be arrranged in a hierarchy from the lowest (smallest, simplest) level to the highest (largest, most complex): morpheme < stem < word < phrase < clause < sentence < paragraph < discourse. Other types of levels are also used, which sometimes include and overlap those already mentioned, e.g., turn (in a dialogue), breath group, episode, etc. [Spanish: nivel [1]]

level [2] (derivational level): In linguistic models which construct a particular linguistic form (such as a word or sentence) using a derivation (a series of steps that results in the desired form), a level is the set of all forms which result from the application (or non-application) of a single rule or a set of rules. [Spanish: nivel [1]]