#geometry

• Anti-squat — Preventing or mitigating pitch-up or front-end lift (the tendency of a vehicle or aircraft to lift its front during acceleration or takeoff); a technical device or structural suspension geometry designed to maintain stability along the longitudinal axis. In automotive and aeronautical engineering, this effect guarantees optimal tire-to-ground contact and prevents loss of aerodynamic control.
• Anticenter — A geometric or astronomical point situated in direct opposition or diametrically opposite to a predetermined center of gravity, geometric center, or focal point. In astronomy, the term often describes the galactic anticenter, meaning the direction on the celestial sphere located exactly 180 degrees away from the geometric center of the Milky Way, positioned toward the Auriga constellation.
• Antiparallel — Being oriented in the same mathematical or geometric direction, but in a strictly opposite sense; a geometric element, vector, or straight line whose vector orientations mutually cancel each other out through direction reversal. In plane geometry, the term defines two lines that intersect two sides of an angle in such a way that they form equal but antipositioned angles relative to a symmetrical axis or a reference secant.
• Antiparallel line — A straight line that intersects the sides of a given angle in such a way that it forms with them an inverted triangle relative to the symmetry of a classic parallel line. This structural arrangement causes the angle formed by the antiparallel with one side to be perfectly equal to the angle formed by the base line with the other side, having important applications in the study of the antiparallel lines theorem in a triangle.
• Antiparallelogram — A convex or self-intersecting quadrilateral in which the opposite sides are equal in pairs, but, unlike a classic parallelogram, one pair of opposite sides intersects, creating a perfect axial symmetry. This structural arrangement provides the geometric figure with remarkable optical and mechanical properties, being frequently used in the design of linkage mechanisms where circular motion must be transformed into rectilinear motion.
• Antipode — A place, geographical point, or region on the Earth's surface located exactly at the intersection of a straight line passing through the center of the Earth, being diametrically opposite to another reference point; also, in a figurative sense, it describes a person, idea, trait, or concept that is in total, radical, and structural opposition to something else.
• Antipodal — Relating to the antipode, belonging to the antipode, or situated at a diametrically opposite point on the surface of a sphere or the Earth; structurally positioned at the end of an imaginary line passing directly through the geometric center of a celestial body. In mathematics, it describes a pair of spherical points that maximize the distance between them, having inverted coordinates.
• Antipedal curve — A plane geometric curve or derived figure obtained as the locus of the feet of perpendiculars drawn from a fixed point (called a pole) onto the normals of a given curve; also, it can define a structural property related to podal curves in higher analytical geometry. This concept is used in studying kinematic properties and complex geometric transformations of lines.
• Antipodic — Belonging to the antipode, relating to the antipode, or situated at a diametrically opposite point on a sphere or the Earth's surface; structurally characterized by the symmetrical reversal of position relative to the geometric center of reference. In an astronomical sense, it describes opposite planetary regions experiencing complementary climatic or gravitational phenomena.
• Counter-pole — A geographical, geometric, or magnetic point situated in a perfectly opposite and symmetrical position relative to a reference pole on a sphere or celestial body; a structural element defined as the diametrically opposite extremity of the central axis of a physical or mathematical system. In a polar sense, it represents the exact antipode of a geographical pole, such as the South Pole in relation to the North Pole.
• Antipolar line — A straight line or derived geometric curve associated with a fixed point (called a pole) within a dual geometric transformation based on inversion, having contrary or symmetrical properties relative to a classical polar line. This structural element is used in higher projective geometry to study inverse polar coordinate systems and the tangency properties of conics.
• Antitropic — Exhibiting inverse symmetry, situated in direct structural opposition, or having physical and geometric properties oriented in the opposite direction relative to a reference element. In anatomy, it describes paired organs or structures facing each other in opposite planes; in crystallography, it refers to symmetrically inverted crystalline axes or faces.
• Annular — Having the shape of a ring or pertaining to a ring; (noun) the fourth digit of the human hand, located between the middle and little fingers, traditionally where the wedding ring is worn; (astronomy) a type of solar eclipse in which the Moon covers only the center of the Sun, leaving a bright outer ring visible.
• Annuloid — Resembling a ring or a torus in shape, without strictly fulfilling their perfect geometric criteria; (noun) a three-dimensional surface or body generated by rotating a closed curve around an axis located in the same plane, used in designing circular mechanical components.
• Enveloping — Surrounding, wrapping, covering, or completely insulating a structure, body, or assembly of elements; in mathematics and physics, it describes a curve, surface, or function (envelope) that is tangent to an entire family of other curves or related shapes, defining their maximum outer perimeter.
• Apollonius — A linguistic variant adapted into the Romanian language for the historical Greek name Apollonios or the Latin Apollonius, used to denote the great scholars of the Hellenistic era; most frequently refers to Apollonius of Perga, the mathematician who laid the foundations for the study of conics, or the Stoic philosopher Apollonius of Chalcedon. This scholarly onomastic form is predominantly used in academic works on the history of science and philology.
• Bow (armă) — An ancient missile weapon for launching arrows, consisting of a curved elastic rod and a cord stretched tightly between its ends. In geometry, it represents a continuous portion of a curve or a circle bounded by two points. In physics and engineering, it is an elastic mechanical element (helical spring, leaf spring) designed to cushion shocks or store mechanical energy. In architecture, it denotes a curved load-bearing structure supporting a vault or wall.
• Arcare — The act of arching and its result; a physical, geometric, or structural process through which an object, line, surface, or construction element is bent, curved, or shaped into the form of an arch. In civil engineering and architecture, it represents the curved configuration of load-bearing structures to optimally distribute gravitational loads.
• Arched — Having a curved, bent, or vaulted shape resembling an arch; a structural or geometric element specially configured to distribute weight or to follow a concave or convex trajectory. In architecture, it describes an opening, ceiling, or bridge supported by mechanical arches.
• Arches — The plural form of the neuter noun 'arc'; curved structural or decorative elements supported by two endpoints, used in architecture to span a space or support a vault or wall. In geometry, it represents continuous portions of curved lines, especially of circles, bounded by two distinct points. In music and engineering, it refers to springs acting as elastic mechanisms or bows used for stringed instruments.