S

/es/
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Thân thiện
Definition
  1. Noun:
    • The 19th letter of the modern English alphabet: "S" is a consonant, representing a speech sound typically described as a voiceless alveolar sibilant, as in "sun" or "hiss".
    • A shape resembling the letter S: Something that has a double curve, like the shape of the letter.
    • A mark or grade indicating satisfactory performance: In some educational systems, "S" can stand for "Satisfactory".
    • The chemical symbol for sulfur: In the periodic table, "S" represents the element sulfur.
    • A unit of electrical conductance, the siemens: In physics, "S" is the symbol for the siemens, the SI unit of electrical conductance.
    • The cardinal direction south: On a compass or map, "S" is the abbreviation for south.
    • A unit of time, the second: In the International System of Units (SI), "s" is the standard symbol for the second.
Usage Examples
  • Noun (Letter):
    • The word "snake" starts with the letter S.
    • He signed his name with a large, looping S.
  • Noun (Shape):
    • The river makes a perfect S-curve through the valley.
  • Noun (Grade):
    • Her report card showed an S for "Satisfactory" in conduct.
  • Noun (Element):
    • S is the atomic symbol for sulfur, which is found in many minerals.
  • Noun (Unit):
    • The conductance of the material is 0.5 S (siemens).
    • The reaction time was measured in milliseconds (ms), where 1 ms = 0.001 s.
Advanced Usage
  • 's (Apostrophe + s):
    • Indicates possession (genitive case): Used with nouns to show ownership or association.
      • The student's book is on the table. (The book belongs to one student.)
      • The students' books are on the table. (The books belong to multiple students.)
    • Indicates contraction of "is" or "has": Used with pronouns or nouns.
      • She's a doctor. (She is a doctor.)
      • He's finished his work. (He has finished his work.)
  • -s (Suffix):
    • Forms the regular plural of most nouns: Added to the end of a singular noun.
      • cat → cats, book → books
    • Forms the third person singular present tense of most verbs: Added to the base form of a verb.
      • He walks, she talks, it runs.
Variants and Related Words
  • S-bend (n): A double curve in a road, pipe, or other feature, shaped like the letter S.
  • S-hook (n): A hook shaped like the letter S, used for connecting or hanging items.
  • S-curve (n): A sinuous or double curve resembling the letter S.
Synonyms
  • South: The cardinal compass point opposite north (when "S" is used as an abbreviation).
  • Second: The SI base unit of time (when "s" is used as a symbol).
  • Sulfur: A yellow, nonmetallic chemical element (when "S" is the chemical symbol).
Related Phrases (Phrasal Verbs)

(Not applicable for the single letter "s".)

Related Idioms
  • Mind one's P's and Q's: To be careful about one's behavior or manners. (This idiom uses the plural forms of the letters P and Q.)
  • Dot the i's and cross the t's: To be meticulous and precise, to take care of every small detail.
Noun
  1. (thermodynamics) a thermodynamic quantity representing the amount of energy in a system that is no longer available for doing mechanical work
    • entropy increases as matter and energy in the universe degrade to an ultimate state of inert uniformity
  2. the 19th letter of the Roman alphabet
  3. a unit of conductance equal to the reciprocal of an ohm
  4. the cardinal compass point that is at 180 degrees
  5. 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)
  6. 1/60 of a minute; the basic unit of time adopted under the Systeme International d'Unites

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