1. A measured quantity of medication administered once or at specific intervals; such as, a specified amount of medication to be taken at certain times: "The patient was very compliant with the doctor’s prescription to take the dose of medication three times each day."
2. The amount of radiation to which someone or something is exposed during a specific time, either accidentally or as part of an experiment or medical treatment: "Years ago many children were exposed to a low dose of radiation when using radiation machines which were available in shoe stores to help determine the proper fit of shoes."
3. An additional ingredient; such as, syrup or other sugary substance added to wine to fortify it: "The flavour of the wine was enhanced by a small dose of sugar that was added during the fermentation process."
4. Amounts, especially of unpleasant things, to which a person is subjected: "Manfred suffered many doses of bad luck."
5. The amount given at one time of a therapeutic drug, diagnostic agent, or radioactivity: "The doctor prescribed three doses of medicine each day for five days to aid in the healing of Dina's bronchitis."
6. Etymology: borrowed from Middle French dose which was borrowed from Late Latin dosis; from Greek dosis, "a portion prescribed"; literally, "a giving" from didonai, "to give".

1. Giving or prescribing medicine in specified amounts: "The doctor provided a prescription for dosing the patient with some experimental medication."
2. Treating with an application or agent: "Madeline was dosing her feet with a salt and hot water mixture to ease the pain of her blisters."

The medical radiation amount which is expressed in roentgens that are provided: The doctor prescribed an air dose for the patient which was to be administered at the local clinic.

The amount of radiation absorbed in biological material: The scientist developed a way to measure the biological dose of the radiation treatment of the lump on the patient’s foot.

The amount of a substance that is sufficient to bring about some significant physiological changes in the affected organism; specifically, the level of exposure to a toxic substance that is required to produce a harmful effect: The doctors continue to study the biological effective doses of radiation that are being administered to treat the skin cancer of Mark's cousin.

A nuclear quantity that accounts for continuing exposures over long periods of time; such as, 30, 50, or 70 years: Radiation treatment is a science that requires careful study of the committed doses of treatments that are administered to determine the appropriate amounts for specific illnesses.

The amount of a toxic or poisonous substance that will cause a person to lose his or her life: The doctor said that Shelby's friend had died from a lethal dose of heroin which had been acquired from a street dealer.

Charlotte was warned by her doctor that there is such a thing as a lethal dose if she were to take too many sleeping pills.

The largest dose (medical and/or radiation) which can be administered with safety: The doctor determined the tolerance dose of 1000 ml. of the new medication for treatment of the growth on the patient’s foot.