S

Definitions of S
  1. noun
    the 19th letter of the Roman alphabet
    synonyms: s
    see moresee less
    type of:
    alphabetic character, letter, letter of the alphabet
    the conventional characters of the alphabet used to represent speech
  2. noun
    the cardinal compass point that is at 180 degrees
    synonyms: due south, south, southward
    see moresee less
    type of:
    cardinal compass point
    one of the four main compass points
  3. noun
    an abundant tasteless odorless multivalent nonmetallic element; best known in yellow crystals; occurs in many sulphide and sulphate minerals and even in native form (especially in volcanic regions)
    synonyms: atomic number 16, sulfur, sulphur
    see moresee less
    types:
    brimstone, native sulfur, native sulphur
    an old name for sulfur
    type of:
    chemical element, element
    any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter
  4. noun
    (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work
    synonyms: entropy, randomness
    see moresee less
    types:
    conformational entropy
    entropy calculated from the probability that a state could be reached by chance alone
    type of:
    physical property
    any property used to characterize matter and energy and their interactions
  5. noun
    a unit of conductance equal to the reciprocal of an ohm
    synonyms: mho, reciprocal ohm, siemens
    see moresee less
    type of:
    conductance unit
    a measure of a material's ability to conduct an electrical charge
Word Family
EDITOR’S CHOICE

Test prep from the experts

Boost your test score with programs developed by Vocabulary.com’s experts.

  • Proven methods: Learn faster, remember longer with our scientific approach.
  • Personalized plan: We customize your experience to maximize your learning.
  • Strategic studying: Focus on the words that are most crucial for success.

SAT/PSAT

$29.95
  • Number of words: 500+
  • Duration: 8 weeks or less
  • Time: 1 hour / week

TOEFL

$29.95
  • Number of words: 500+
  • Duration: 10 weeks or less
  • Time: 1 hour / week