noun

• A knot, knob, protuberance or swelling.
• (astronomy) The point where the orbit of a planet, as viewed from the Sun, intersects the ecliptic. The ascending and descending nodes refer respectively to the points where the planet moves from South to North and N to S; their respective symbols are ☊ and ☋.
• (botany) A leaf node.
• (networking) A computer or other device attached to a network.
• (engineering) The point at which the lines of a funicular machine meet from different angular directions.
• (geometry) The point at which a curve crosses itself, being a double point of the curve. See crunode and acnode.
• (geometry) A similar point on a surface, where there is more than one tangent-plane.
• (graph theory) A vertex or a leaf in a graph of a network, or other element in a data structure.
• (medicine) A hard concretion or incrustation which forms upon bones attacked with rheumatism, gout, or syphilis; sometimes also, a swelling in the neighborhood of a joint.
• (physics) A point along a standing wave where the wave has minimal amplitude.
• (rare) The knot, intrigue, or plot of a dramatic work.
• (technical) A hole in the gnomon of a sundial, through which passes the ray of light which marks the hour of the day, the parallels of the Sun's declination, his place in the ecliptic, etc.
• (computational linguistics) The word of interest in a KWIC, surrounded by left and right cotexts.
• (electronics) A region of an electric circuit connected only by (ideal) wires (i.e the voltage between any two points on the same node must be zero).
• Acronym of New Oxford Dictionary of English.