Definition

1. Noun:

   • The cardinal number that is the product of ten and three: The natural number following twenty-nine and preceding thirty-one, represented by the symbols 30 or XXX.

2. Adjective:

   • Being ten more than twenty: Quantifying an amount or position in a sequence equal to three times ten.

Usage Examples

• Noun:

  • The total number of students in the class is 30.
  • She scored 30 out of 30 on the test.

• Adjective:

  • He has 30 unread messages in his inbox.
  • The recipe requires 30 grams of sugar.

Advanced Usage

• "In one's 30s": Referring to the decade of life between the ages of 30 and 39.

  • She started her own company in her 30s.

• "30 something": Used informally to describe a person or thing that is approximately thirty years old or thirty in number.

  • The new manager is a 30-something professional from the city.

Variants and Related Words

• Thirtieth (adj., n.): Constituting number thirty in a sequence; the ordinal form corresponding to the cardinal number 30.

  • Today is her thirtieth birthday.
  • He finished in thirtieth place.

• Thirtyfold (adj., adv.): Thirty times as great or as numerous.

  • The investment saw a thirtyfold increase.

Synonyms

• Thirty (n., adj.): The word itself is its own primary synonym as a numeral.
• Three tens (n.): A descriptive synonym indicating the composition.
• XXX (n.): The Roman numeral representation.

Related Phrases

• 30-30 (n.): A term often used to denote specific models or calibers, such as the .30-30 Winchester rifle cartridge.
• 30 Rock (n.): The common name for the GE Building at 30 Rockefeller Plaza in New York City.

Idioms and Cultural References

• "30 for 30": The title of a series of documentary films by ESPN, each telling a significant sports story.
• "30 pieces of silver": An idiom originating from the Bible (Matthew 26:15), symbolizing a betrayal for a meager reward, referring to the sum paid to Judas Iscariot.
• "-30-": A traditional notation used in journalism and telegraphy to indicate the end of a story or message.

Adjective

1. being ten more than twenty

Noun

1. the cardinal number that is the product of ten and three