What does x stand for?

Abscissa (IDOE)

Allgemeiner Variablenvektor (SAUS)

Amount of Impurity Additions [Metallic conductors] [Symbol] (UWER)

Axis [ of a cylindrical lens] [Ophthalmology] (DAVI)

Concentration [Symbol] (UWER)

Deviation of Controlled Condition [Control systems] [Symbol] (UWER)

Displacement [X-direction] [Symbol] (UWER)

Distance [Symbol] (UWER)

Elevation [Symbol] (UWER)

execute(d) (SAUS)

execution(er) (SAUS)

experiment (SAUS)

express (SAUS)

extract(ed) (SAUS)

First Rectangular Coordinate [Of a point] [Symbol] (UWER)

gang territorial mark(er) or place where one gang will fight another (SAUS)

Haploid Number of Chromosomes [Genetics] (UWER)

Length [Symbol] (UWER)

Mean Result [Statistics] [Symbol] (UWER)

Measured Value [Statistics] [Symbol] (UWER)

Mole Fraction [Symbol] (UWER)

Multiplication (IDOE)

Number of Carriers (IDOE)

Roentgen [Ray] [Radiology] (DAVI)

Takes [As in K x B - King Takes Bishop] [Chess]

Unknown Quantity (IDOE)

Without [Therapy term] (CTAA)

Xylose [As substituent on nucleoside] [Biochemistry]

Abscissa of a Coordinate (BARN)

Amino Acid, Unknown or Other [Symbol] [Biochemistry]

Amplitude of Displacement (UWER)

Arithmetic Average [Symbol] (UWER)

Arithmetic Mean [Statistics]

Atmospherics [Radio engineering] (UWER)

Atomic Fraction (UWER)

Bond-Site Repulsion [Symbol] (UWER)

By [As in 9 x 12]

Central Drug Research Institute [India] [Research code symbol]

Chi (SAUS)

Chile [IYRU nationality code] (IYR)

Christus [Christ] [Latin]

Closed [Aviation] (PIPO)

Closed at All Times (Except When in Actual Use) [Ship's fittings classification]

Combined Services (SAUS)

Computer (UWER)

Concentration [Symbol] (UWER)

Contact [Between electrical lines] [Symbol] (UWER)

Cross [Referring to sections] [Pathology] (DAVI)

Cross [As in X-roads]

Crossed With (DAVI)

Crossmatch [Hematology] (DAVI)

Cross Reactance (SAUS)

Crystal (UWER)

Crystal Cut [Symbol] (DEN)

Decem [Ten] [Latin]

Dimension [Symbol] (UWER)

Drill Sergeant [Army skill qualification identifier]

Ecstasy [Synthetic stimulant]

Electronegativity [Symbol] (UWER)

Ethnikon Agrotikon Komma Xiton [National Agrarian Party "X"] [Political party] (PPE)

Examination [Slang]

Except (DAVI)

Exchange

Exclusive [Concession in a circus or carnival]

Exercise [British military] (DMA)

Exhibitions [Trade fairs, etc.] [Public-performance tariff class] [British]

Ex-Husband [or Ex-Wife] [Slang]

Ex-Interest [Without the right to interest] [Finance]

Exit [Computer science] [Telecommunications]

Exophoria (SAUS)

Exophoria Distance [Ophthalmology]

expansion (SAUS)

Experimental [Military] (AABC)

Experimental Stage (UWER)

Experimental / Under Development (SAUS)

Explicit Sexual Content [Motion-picture rating] (UWER)

Explosion [Military] (CAAL)

Explosive (SAUS)

Export [Economics]

Exposure [Radiometry] (UWER)

Exposure Rate [Symbol] (UWER)

Extension (AAG)

Extra

Extraordinary (SAUS)

Facsimile Equipment [Symbol] (UWER)

Female Chromosome

Flag of the international code of signals. (SAUS)

Force Component [Symbol] (UWER)

Frost

Halogen [Symbol] (UWER)

Haploid Generation [Biology] (BARN)

Heavenly Body (SAUS)

Hexadecimal [Computer science] (IAA)

Homeopathic Symbol for Decimal Scale of Potencies [Medicine] (PALA)

Horizontal Deflection [Symbol] (DEN)

Index [Computer science]

Inductive reactance (SAUS)

Intense [Weather codes - aviation] (PIPO)

Internal Stress Tensor [Symbol] (UWER)

Involved in an Accident [Motor vehicle violation code used in state of Maryland] (MVRD)

In Which [Telegraphy] (PCTE)

Kienboeck's Unit [of x-ray dosage] (AAMN)

Kiss [Correspondence]

Komma Xiton Ethnikis Antistasseos ["X" National Resistance Party] [Political party] (PPE)

Lateral [RADAR]

Location [Symbol on map]

Midweek Travel [Airline fare code]

Mining Engineering [Discipline category abbreviation] (UWER)

Mistake [or Error] [Symbol]

Multiplication (IDOE)

No Connection (IDOE)

No Protest [Banking]

Parallactic Angle

Phase Distortion [Symbol] (UWER)

Phase Distribution [Symbol] (UWER)

Psychological Problem [Classification system used by doctors on Ellis Island to detain, re-examine, and possibly deny entry to certain immigrants]

Quantity of Component Adsorbed [Symbol] (UWER)

Radial Load Factor [Symbol] (UWER)

Radiotelegraphy (UWER)

Raw Score [Psychology]

Reactance [Measurement and physics] (DAVI)

Reactor (UWER)

Removal of [Surgery] (DAVI)

Repellent (UWER)

Research [or Experimental] [Designation for all US military aircraft]

Respirations [On anesthesia chart] (DAVI)

Sample Ions [Ion chromatography] [Symbol] (UWER)

Simes [Italy] [Research code symbol]

Solubility [Symbol] (UWER)

St. Andrew's Cross

Start of Anesthesia (DAVI)

Strike [Bowling symbol]

Submersible Craft [Self-propelled] [Navy ship symbol]

Ten [Roman numeral]

Times [Multiplication sign] [Mathematics]

Time Zone 157.5W-172.5 W [GMT + 11]

Toilet [Slang]

Transistor [Symbol] (DEN)

Transmission (UWER)

Transmit

Transverse [Referring to sections] [Pathology] (DAVI)

United States Steel [Company symbol]

Unknown Quantity (IDOE)

USX Marathon [NYSE symbol] (SAG)

USX US Steel Group [Wall Street slang name: "Steel"] [NYSE symbol] (SPSG)

Volume Fraction [Symbol] (UWER)

Xanthosine [One-letter symbol; see Xao]

X-Axis

X-Axis of External Tank (SAUS)

X-Axis of Orbiter (SAUS)

X-Axis of Payload (SAUS)

X-Axis of Solid Rocket Booster (SAUS)

X-Axis of Spacelab (SAUS)

Xenon [Chemical element] (IAA)

Xenopsylla [A genus of fleas] (DAVI)

Xerographic Photocopy of Source

Xerxes [Phonetic alphabet] [Royal Navy] [World War I] (DSUE)

X-Ray [Phonetic alphabet] [Pre-World War II] [International] [World War II] (DSUE)

X-Ray Assistant [British military]

X-Ray Tube [Symbol] (UWER)

X-Ray Unit [Symbol] (UWER)

X Records [Division of RCA-Victor] [Record label]

Xylem [Botany]