What does half life mean?

Definitions for half life
half life

This dictionary definitions page includes all the possible meanings, example usage and translations of the word half life.

Princeton's WordNet

  1. half life, half-lifenoun

    the time required for something to fall to half its initial value (in particular, the time for half the atoms in a radioactive substance to disintegrate)


  1. half life

    Half-life is a term commonly used in science, specifically in the fields of nuclear physics and chemistry. It refers to the amount of time required for a quantity to reduce to half its initial size or value. For example, in radioactive decay, it's the time it takes for half of the radioactive atoms in a sample to decay. It also has other applications in biology, pharmacology, and geology, largely in processes that follow exponential decay pattern.

Suggested Resources

  1. half life

    Read the full text of the Half Life poem by Kurt Philip Behm on the Poetry.com website.

Matched Categories

How to pronounce half life?

How to say half life in sign language?


  1. Chaldean Numerology

    The numerical value of half life in Chaldean Numerology is: 7

  2. Pythagorean Numerology

    The numerical value of half life in Pythagorean Numerology is: 5

Examples of half life in a Sentence

  1. David Solomon:

    There is a short half-life. The longer you wait, the more it depreciates in value.

  2. Marc Baum:

    You’re very limited with the range of drugs that are amenable to this technology, they have to be potent, have a long half-life in the body and be very soluble.

  3. David Brenner:

    Radioactivity has a half-life, it does simply decay away in roughly a day or two.

  4. James Curleigh:

    The best that you ever look in a piece of fast fashion is the first time you wear it. It has this sort of half-life, we'd rather people have fewer products, but better products from Levi's.

Translations for half life

From our Multilingual Translation Dictionary

Get even more translations for half life »


Find a translation for the half life definition in other languages:

Select another language:

  • - Select -
  • 简体中文 (Chinese - Simplified)
  • 繁體中文 (Chinese - Traditional)
  • Español (Spanish)
  • Esperanto (Esperanto)
  • 日本語 (Japanese)
  • Português (Portuguese)
  • Deutsch (German)
  • العربية (Arabic)
  • Français (French)
  • Русский (Russian)
  • ಕನ್ನಡ (Kannada)
  • 한국어 (Korean)
  • עברית (Hebrew)
  • Gaeilge (Irish)
  • Українська (Ukrainian)
  • اردو (Urdu)
  • Magyar (Hungarian)
  • मानक हिन्दी (Hindi)
  • Indonesia (Indonesian)
  • Italiano (Italian)
  • தமிழ் (Tamil)
  • Türkçe (Turkish)
  • తెలుగు (Telugu)
  • ภาษาไทย (Thai)
  • Tiếng Việt (Vietnamese)
  • Čeština (Czech)
  • Polski (Polish)
  • Bahasa Indonesia (Indonesian)
  • Românește (Romanian)
  • Nederlands (Dutch)
  • Ελληνικά (Greek)
  • Latinum (Latin)
  • Svenska (Swedish)
  • Dansk (Danish)
  • Suomi (Finnish)
  • فارسی (Persian)
  • ייִדיש (Yiddish)
  • հայերեն (Armenian)
  • Norsk (Norwegian)
  • English (English)

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:


Use the citation below to add this definition to your bibliography:


"half life." Definitions.net. STANDS4 LLC, 2023. Web. 1 Dec. 2023. <https://www.definitions.net/definition/half+life>.

Discuss these half life definitions with the community:


    Are we missing a good definition for half life? Don't keep it to yourself...

    Image or illustration of

    half life

    Credit »

    Free, no signup required:

    Add to Chrome

    Get instant definitions for any word that hits you anywhere on the web!

    Free, no signup required:

    Add to Firefox

    Get instant definitions for any word that hits you anywhere on the web!

    Browse Definitions.net


    Are you a words master?

    • A. abide
    • B. rumpus
    • C. abduct
    • D. famish

    Nearby & related entries:

    Alternative searches for half life: