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View synonyms for infectious

infectious

[in-fek-shuhs]

adjective

  1. communicable by infection, as from one person to another or from one part of the body to another.

    infectious diseases.

    Synonyms: catching
  2. causing or communicating infection.

  3. tending to spread from one to another.

    infectious laughter.

  4. Law.,  capable of contaminating with illegality; exposing to seizure or forfeiture.

  5. Obsolete.,  diseased.



infectious

/ ɪnˈfɛkʃəs /

adjective

  1. (of a disease) capable of being transmitted Compare contagious

  2. (of a disease) caused by microorganisms, such as bacteria, viruses, or protozoa

  3. causing or transmitting infection

  4. tending or apt to spread, as from one person to another

    infectious mirth

  5. international law

    1. tainting or capable of tainting with illegality

    2. rendering liable to seizure or forfeiture

“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

infectious

  1. Capable of causing infection.

  2. See Note at contagious

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Other Word Forms

  • infectiously adverb
  • infectiousness noun
  • noninfectious adjective
  • noninfectiously adverb
  • noninfectiousness noun
  • uninfectious adjective
  • uninfectiously adverb
  • uninfectiousness noun
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Word History and Origins

Origin of infectious1

First recorded in 1535–45; infect(ion) + -ious
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Synonym Study

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Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

His personality was infectious and the supporters warmed to him.

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They added: "We are so proud of everything she achieved in her life and can't begin to imagine life without her infectious smile and laughter all around us."

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“He was passionate about it, which came through in everything he did, and that passion was infectious, lifting up everyone around him.”

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Fuel that infectious joy with the most twirl-worthy — and arguably most underrated — track of Swift’s career, “Sweeter Than Fiction.”

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Bell has an infectious optimism, an endearing love of her craft and is impressively clear in what makes her tick.

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infectioninfectious anemia of horses