#actie

• Aberration / Anomaly — A state, manifestation, or structure presenting a pathological deviation from the normal or physiological type. In genetics, it represents a structural or numerical anomaly of chromosomes; in neuropsychiatry, it denotes a wandering of cognitive functions or a severe thought disorder; in ophthalmology, it indicates an optical error of the eye (refractive defect) preventing a clear image on the retina.
• Aberrometer — A high-precision clinical diagnostic device used in ophthalmology to automatically measure and record the total optical aberrations of the eye (both lower-order aberrations like myopia and astigmatism, and higher-order ones like coma or trefoil). The device operates based on wavefront analysis, projecting a harmless laser beam onto the retina and measuring light distortions as it exits the eye, providing an essential digital map for customized refractive surgery.
• Abreaction — (Psychoanalysis) A liberating emotional discharge whereby an individual releases the tension of a repressed psychic trauma by consciously reliving the original event and its associated affective states.
• Abstraction — A purely theoretical notion, idea, or mental category resulting from the process of abstraction; an entity that has no material or physical existence in reality. In everyday language, the term often appears in fixed phrases related to the intentional ignoring of an element or circumstance in an analysis.
• Abstraction (literary) — A less frequent lexicographical form or literary variant for the noun 'abstracție', defining the result of the mental operation of isolating and generalizing the essential traits of an object; a process of pure detachment from sensory elements or physical reality.
• Action — A structural physical quantity defined by the product of energy and time, used in analytical and quantum mechanics; a force or influence exerted by one body upon another, according to the principle of dynamics where every action has an equal and opposite reaction. In old technical language, the term is synonymous with action, representing a process of exerting mechanical energy.
• Actinic — Relating to radiation or luminous flux; capable of producing intense chemical (and photochemical) changes or reactions in the substances it strikes or traverses. Actinic properties are characteristic primarily of ultraviolet spectrum radiation and short-wave solar rays, being essential in the exposure process of conventional photographic emulsions or in triggering biological phenomena within living tissues.
• Actinism — A structural and physiological property of luminous radiation, particularly short-wavelength radiation within the ultraviolet spectrum, to induce chemical reactions or molecular modifications in directly exposed photosensitive substances. This phenomenon constitutes the historical foundation of analog photographic technologies, light-triggered chemical synthesis processes, and complex biological reactions within living tissues.
• Activant — That which activates, accelerates, or stimulates a chemical process, a physical reaction, or a biological function; a substance or structural agent added to a system to increase its reactivity, reaction rate, or operational efficiency. It acts as a positive catalyst within a specific environment.
• Deal-sealing drink — A traditional Romanian custom consisting of offering a treat (usually drink or food) by the buyer to the seller and witnesses, to seal and celebrate the conclusion of a commercial transaction (especially the sale of animals or land); the drink offered on this occasion. This structural ritual holds a symbolic value of socially confirming the deal, marking the binding nature of the unwritten contract.
• Adelphotaxis — A biological or cytological phenomenon consisting of the mutual attraction, directed movement, and tendency for structural alignment or grouping of cells or unicellular organisms of the same species or with similar genetic characteristics. This cellular mechanism plays an important role in the early stages of bacterial colony organization or in tissue morphogenesis processes.
• Addition — The act of adding and its result; a fundamental chemical process through which two or more molecules combine to form a single, more complex product without the elimination of by-products; broadly, it represents the operation of addition, a supplementary element brought to an assembly, or the phenomenon of inserting a segment into a pre-existing structure to modify or improve its properties.
• Addition — The act of additioning and its result; a fundamental chemical process in which two or more molecules combine to form a single main product without the elimination of by-products, characteristic of unsaturated compounds. In a broad sense, it represents the operation of adding, supplementing, or structurally attaching new elements to a pre-existing assembly to modify or improve its properties.
• Air-breathing jet — Utilizing the reaction of atmospheric air absorbed and expelled at high speed to produce the propulsion force necessary for movement; a system, engine, or aircraft based on burning a fuel in atmospheric oxygen. This type of structural propulsion is specific to modern turbojet airplanes, differing from rockets in that it does not carry its own oxidizer.
• Jet engine — An air-breathing jet engine (reactive) that utilizes surrounding air as an oxidizer for burning fuel and generating propulsion force through the rapid expulsion of exhaust gases. Unlike rocket engines, this structural mechanical assembly fully depends on the presence of Earth's atmosphere to function, being widely used in modern airliners and supersonic aircraft.
• Business — An economic, commercial, financial, or industrial activity conducted in an organized manner by a person or a company with the aim of producing profit, goods, or services; a transaction, trade, or entrepreneurial project. In a broad structural sense, it designates any regulated action, business deal, commercial trade, or private matter involving financial speculation, a speculative arrangement, or a profitable market-oriented activity.
• Aphakia — An ocular medical condition characterized by the absence of the crystalline lens from the structure of the eyeball, most commonly occurring following surgical removal due to cataracts or, more rarely, resulting from severe trauma or congenital anomalies. This structural defect induces a severe reduction in focusing ability (a major refractive error) and the complete loss of visual accommodation, requiring correction via an intraocular lens implant, specialized contact lenses, or high-diopter eyeglasses.
• Affinity — 1. Mutual attraction, deep sympathy, spiritual compatibility, or harmony of characters between people. 2. The legal relationship established by marriage between one spouse and the relatives of the other (affinity). 3. The tendency of chemical substances to combine. Generally, a structural or conceptual similarity.
• Agalactia — A pathological condition characterized by the complete absence of milk secretion in the mother (human or female mammals) after childbirth. This structural and functional disorder can be caused by severe endocrine dysfunctions, malformations of the mammary glands, intense febrile states, strong emotional stress, or malnutrition.
• Agile — Moving with great ease, speed, and grace; nimble, brisk, quick in movements. In a structural and figurative sense, the term describes a mind capable of understanding, processing, and reacting promptly to complex stimuli, as well as modern working methodologies based on flexibility, iteration, and rapid adaptability to change.