<reduction> In beta reduction, when a term containing a free occurrence of a variable v is substituted into another term where v is bound the free v becomes spuriously bound or "captured". E.g. ( x . y . x y) y --> y . y y (WRONG) This problem arises because two distinct variables have the same name. The most common solution is to rename the bound variable using alpha conversion: ( x . y' . x y') y --> y' . y y' Another solution is to use de Bruijn notation. Note that the argument expression, y, contained a {free variable}. The whole expression above must therefore be notionally contained within the body of some {lambda abstraction} which binds y. If we never reduce inside the body of a lambda abstraction (as in reduction to {weak head normal form}) then name capture cannot occur. (1995-03-14)

Electron capture (K-electron capture, also K-capture, or L-electron capture, L-capture) is a process in which the proton-rich nucleus of an electrically neutral atom absorbs an inner atomic electron, usually from the K or L electron shells. This process thereby changes a nuclear proton to a neutron and simultaneously causes the emission of an electron neutrino.

Carbon capture and storage (CCS) or carbon capture and sequestration is the process of capturing carbon dioxide (CO2) before it enters the atmosphere, transporting it, and storing it (carbon sequestration) for centuries or millennia. Usually the CO2 is captured from large point sources, such as a chemical plant or biomass power plant, and then stored in an underground geological formation.

Neutron capture therapy (NCT) is a type of radiotherapy for treating locally invasive malignant tumors such as primary brain tumors, recurrent cancers of the head and neck region, and cutaneous and extracutaneous melanomas. It is a two-step process: first, the patient is injected with a tumor-localizing drug containing the stable isotope boron-10 (B), which has a high propensity to capture low energy "thermal" neutrons.

An electronic data capture (EDC) system is a computerized system designed for the collection of clinical data in electronic format for use mainly in human clinical trials. EDC replaces the traditional paper-based data collection methodology to streamline data collection and expedite the time to market for drugs and medical devices.

The Media Capture API is a web standard under development to allow web applications to access the media capture capabilities of a device (typically a Smartphone or other Mobile Internet device). This would allow a web application to include a function to record audio via the device's microphone, and take a picture or record a video with the device's camera.

(captures, capturing, captured)