billionth

Thân thiện

One scientist carefully measures one billionth of a gram of a substance.

Definition

1. Adjective:

   • Being the ordinal number corresponding to one billion in a sequence: Used to describe the position of something that is number 1,000,000,000 in an ordered list or series.

2. Noun:

   • One of a billion equal parts: A unit of measurement representing one part out of one billion equal parts of a whole.
   • The item in the one-billionth position: The element that occupies the 1,000,000,000th place in a countable series.

Usage Examples

• Adjective:

  • This is the billionth time I've told you to be careful. (This emphasizes an extremely high, often exaggerated, ordinal position in a sequence of events.)
  • The billionth digit of pi is very difficult to calculate. (This refers to the digit occupying the precise 1,000,000,000th position.)

• Noun (one part):

  • A nanometer is one billionth of a meter. (This uses the noun to define a precise fractional measurement.)
  • The concentration of the pollutant was measured in parts per billionth. (This shows its use in scientific ratios.)

• Noun (position):

  • She was the billionth visitor to the website and won a prize. (This refers to the person occupying that specific ordinal position in a count.)

Advanced Usage

• In figurative/exaggerated speech: The adjective is often used hyperbolically to express frustration over something repeated a seemingly infinite number of times.

  • For the billionth time, the answer is no!

• In precise scientific and mathematical contexts: The noun form is used for exact fractional measurements, especially in fields like physics, chemistry, and engineering.

  • The processor can execute an instruction in a few billionths of a second.

Variants and Related Words

• Billion (n): The cardinal number 1,000,000,000.
• Billionfold (adv/adj): By a factor of one billion; a billion times as great.

Synonyms

• Ordinal: (For the adjective) 1,000,000,000th.
• Fraction: (For the noun) One part in 10^9.

Notes on Different Meanings

• The core meanings are strictly numerical (ordinal position and fractional part). The exaggerated use ("the billionth time") is a common idiomatic extension of the ordinal meaning, not a separate definition.

Học thuật

Adjective

1. the ordinal number of one billion in counting order

Noun

1. one part in a billion equal parts
2. position 1,000,000,000 in a countable series of things

Từ đồng nghĩa

• one-billionth