Interface and Span

noun

• Chemistry) a surface forming a common boundary between two things (two objects or liquids or chemical phases. ()
• Computer science) a program that controls a display for the user (usually on a computer monitor) and that allows the user to interact with the system.
  • synonyms: user interface
• The overlap where two theories or phenomena affect each other or have links with each other.
  • usage: "the interface between chemistry and biology"
• Computer science. ( computer circuit consisting of the hardware and associated circuitry that links one device with another (especially a computer and a hard disk drive or other peripherals)).
  • synonyms: port

noun

• The complete duration of something.
  • usage: "the job was finished in the span of an hour"
• The distance or interval between two points.
• Two items of the same kind.
  • synonyms: couple, pair, twosome, twain, brace, yoke, couplet, distich, duo, duet, dyad, duad
• A unit of length based on the width of the expanded human hand (usually taken as 9 inches. )
• A structure that allows people or vehicles to cross an obstacle such as a river or canal or railway etc..
  • synonyms: bridge
• The act of sitting or standing astride.
  • synonyms: straddle

verb

• To cover or extend over an area or time period.
  • usage: "Rivers traverse the valley floor, "The parking lot spans 3 acres"; "The novel spans three centuries"
  • synonyms: cross, traverse, sweep

• (v.t.) Hence, a small space or a brief portion of time.
• (v.t.) The spread or extent of an arch between its abutments or of a beam, girder, truss, roof, bridge or the like, between its supports.
• (v.t.) A pair of horses or other animals driven together; usually, such a pair of horses when similar in color, form, and action.
• (v.t.) To measure by the span of the hand with the fingers extended or with the fingers encompassing the object; as, to span a space or distance; to span a cylinder.
• (v.t.) To reach from one side of to the order; to stretch over as an arch.
• (v.t.) The space from the thumb to the end of the little finger when extended; nine inches; eighth of a fathom.
• imp. & p. p. of Spin.
• (v.t.) To fetter, as a horse; to hobble.
• (v.t.) A rope having its ends made fast so that a purchase can be hooked to the bight; also, a rope made fast in the center so that both ends can be used.
• (v.i.) To be matched, as horses.
• (imp.) of Spin.

To cover all contingencies within a specified range.