XX

Học thuật
Thân thiện
Definition

  1. Adjective:

    • Denoting a quantity consisting of 20 items or units: Used to describe a group or amount that totals twenty.

  2. Noun:

    • The cardinal number that is the sum of nineteen and one: The number 20, represented by the symbol "20" or the Roman numeral "XX".
    • (Genetics) Normal complement of sex chromosomes in a female: In genetics, this refers specifically to the pair of X chromosomes (XX) that is typical in female mammals, determining biological sex.
Usage Examples

  • Adjective:

    • She bought xx apples for the recipe. (She bought twenty apples.)
    • The team consists of xx members. (The team has twenty members.)

  • Noun (Number):

    • The answer on the board was xx. (The answer was twenty.)
    • He scored xx points in the game. (He scored twenty points.)

  • Noun (Genetics):

    • Humans with an xx chromosome pattern are typically female.
    • The xx genotype is one of the fundamental determinants of sex in many species.
Advanced Usage
  • In formal or technical writing: "XX" is often used in Roman numeral form to denote the number twenty, especially in outlines, copyright dates, or formal titles.
    • Chapter XX of the book discusses advanced theories.
  • In genetics and biology: The term is used precisely to describe chromosomal sex.
    • The study focused on gene expression in XX individuals.
Variants and Related Words
  • Twentieth (adj., n.): Constituting number twenty in a sequence; the ordinal form of twenty.
    • This is the twentieth anniversary.
  • Score (n.): An archaic or literary term for a group of twenty.
    • "Four score and seven years ago..." (Eighty-seven years ago...)
  • XY (n.): The normal complement of sex chromosomes in a male.
Synonyms
  • Twenty: The word form of the number.
  • A score: (Archaic/Literary) A group of twenty.
Related Phrases
  • Double X: An informal way to refer to the female sex chromosome pair.
  • XX/XY system: The common chromosomal sex-determination system in mammals.
Notes on Usage
  • In most general contexts (mathematics, counting), "twenty" is the standard word. "XX" as a standalone word for the number is rare outside of specific symbolic uses (like Roman numerals).
  • In genetics, "XX" is a standard scientific term and is not typically replaced by the word "twenty." It is read as "X X" or "double X."
  • This entry primarily covers the symbolic/numeric and genetic uses of "xx." It is distinct from its use as a placeholder (e.g., "Size: XXL") or a mark for obscenity.
Adjective
  1. denoting a quantity consisting of 20 items or units
Noun
  1. (genetics) normal complement of sex chromosomes in a female
  2. the cardinal number that is the sum of nineteen and one

Từ đồng nghĩa

Từ tương tự

Từ gần giống

Từ chứa "XX"