(grammar) A subclass of perfective verbs that denotes a momentary or punctiliar action (e.g., to sneeze, to blink).

(grammar) A temporal feature of the verb which denotes the speaker's standpoint of the event described by the verb, as from outside of the event and seeing it as a completed whole.

The ratio of an object's longest dimension to its next-longest dimension. / The ratio of width to height in a flat surface or 2-dimensional abstract construction, such as an image, character, or pixel.

(grammar) A feature of a verb which denotes that its action or condition does not have a fixed temporal boundary, but is habitual, unfinished, continuous, repetitive or in progress.

(grammar) A feature of the verb which denotes viewing the event the verb describes as a completed whole, rather than from within the event as it unfolds. For example, "she sat down" as opposed to "she was sitting down". Since the focus is on the completion of what is expressed by the verb, this aspect is generally associated with the past and future tenses. This term is often used interchangeably with aorist aspect. This is not to be confused with the perfect tense.

(grammar) A feature of the verb which specifies an action as occurring habitually, usually, ordinarily, or customarily

(grammar) A subclass of imperfective verbs that denotes a continuously repeated action. An example in English would be the frequentative verb "to crackle," as opposed to the nonfrequentative "to crack."

(linguistics) A grammatical aspect that expresses the state of the subject that is continuing the action.

(linguistics) A grammatical aspect that expresses the dynamic quality of actions that are in progress.

(rail transport) The visual appearance of a railway signal