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  1. ILLNESS Definition & Meaning - Merriam-Webster

    The meaning of ILLNESS is sickness. How to use illness in a sentence.

  2. ILLNESS | English meaning - Cambridge Dictionary

    (Definition of illness from the Cambridge Academic Content Dictionary © Cambridge University Press)

  3. Is It a Disease or an Illness? - Cleveland Clinic Health Essentials

    Mar 7, 2025 · Is there a difference between a disease and an illness? Technically, yes. A disease is something a physician can diagnose, and an illness is something you feel.

  4. What is Illness: Symptoms, Causes, Diagnosis, and Treatment

    Illness is a broad term that defines the poor state of mind, body, and, to a certain extent, spirit. It is the general feeling of being sick or unwell (outside the person’s belief of good health).

  5. illness noun - Definition, pictures, pronunciation and usage notes ...

    Definition of illness noun in Oxford Advanced American Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.

  6. ILLNESS definition and meaning | Collins English Dictionary

    Illness is the fact or experience of being ill. If your child shows any signs of illness, take her to the doctor. Mental illness is still a taboo subject. An illness is a particular disease such as measles or …

  7. Illness - definition of illness by The Free Dictionary

    If you have an illness, there is something wrong with your health. An illness can last for a long time or a short time, and its effects can be serious or not serious.

  8. What Is Illness? Definition, Types, and Causes - Biology Insights

    Dec 12, 2025 · Clarify the definition of illness, differentiating it from disease and sickness. Explore the complex causes and the subjective nature of poor health.

  9. Disease - Wikipedia

    In humans, disease is often used more broadly to refer to any condition that causes pain, dysfunction, distress, social problems, or death to the person affected, or similar problems for those in contact …

  10. Illness - Definition, Meaning & Synonyms | Vocabulary.com

    /ˈɪlnɪs/ IPA guide Other forms: illnesses Definitions of illness noun impairment of normal physiological function affecting part or all of an organism synonyms: malady, sickness, unwellness