In linguistics, aspect is a grammatical category that expresses how an action, event, or state, denoted by a verb, extends over time. Perfective aspect is used in referring to an event conceived as bounded and unitary, without reference to any flow of time during ("I helped him").

Tense–aspect–mood (commonly abbreviated ) or tense–modality–aspect (abbreviated as ) is a group of grammatical categories that are important to understanding spoken or written content, and which are marked in different ways by different languages.Disambiguating Tense, Aspect and Modality Markers for Correcting Machine Translation Error Anil Kumar et al.

<programming> (AOP) A style of programming that attempts to abstract out features common to many parts of the code beyond simple functional modules and thereby improve the quality of software. Mechanisms for defining and composing abstractions are essential elements of programming languages. The design style supported by the abstraction mechanisms of most current languages is one of breaking a system down into parameterised components that can be called upon to perform a function. But many systems have properties that don't necessarily align with the system's functional components, such as failure handling, persistence, communication, replication, coordination, memory management, or real-time constraints, and tend to cut across groups of functional components. While they can be thought about and analysed relatively separately from the basic functionality, programming them using current component-oriented languages tends to result in these aspects being spread throughout the code. The source code becomes a tangled mess of instructions for different purposes. This "tangling" phenomenon is at the heart of much needless complexity in existing software systems. A number of researchers have begun working on approaches to this problem that allow programmers to express each of a system's aspects of concern in a separate and natural form, and then automatically combine those separate descriptions into a final executable form. These approaches have been called aspect-oriented programming. {Xerox AOP homepage (http://parc.xerox.com/csl/projects/aop/)}. AspectJ (http://AspectJ.org/). {ECOOPP'99 AOP workshop (http://wwwtrese.cs.utwente.nl/aop-ecoop99/)}. (1999-11-21)