You can't argue with facts: a fact is something proven to be true. It's important to distinguish between fact and fiction.

When someone says, "Is that a fact?" they're asking "Is that really true?" When a detective says, "Give me the facts," he only wants information that is rock solid and confirmed. The job of science is to study things and figure out what the facts are in every field. Theories and opinions are not facts: you need to have proof for something to be a fact.

Definitions of fact
  1. noun
    a piece of information about circumstances that exist or events that have occurred
    “first you must collect all the facts of the case”
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    the actual state of things
    detail, item, point
    an isolated fact that is considered separately from the whole
    particular, specific
    a fact about some part (as opposed to general)
    a fact about the whole (as opposed to particular)
    matter of fact
    a matter that is an actual fact or is demonstrable as a fact
    facts learned by observing
    a fact that logically justifies some premise or conclusion
    the facts about an actual situation
    a fact that has been verified
    obscure or miscellaneous facts about a range of subjects, especially as answers to questions in a game
    scientific fact
    an observation that has been confirmed repeatedly and is accepted as true (although its truth is never final)
    home truth
    an important truth that is unpleasant to acknowledge (as about yourself)
    an enduring or necessary ethical or religious or aesthetic truth
    a small or minor detail
    nook and cranny, nooks and crannies
    something remote
    regard, respect
    (usually preceded by `in') a detail or point
    sticking point
    a point at which an impasse arises in progress toward an agreement or a goal
    technicality, trifle, triviality
    a detail that is considered insignificant
    (medicine) a reason to prescribe a drug or perform a procedure
    (medicine) a reason that makes it inadvisable to prescribe a particular drug or employ a particular procedure or treatment
    type of:
    knowledge acquired through study or experience or instruction
  2. noun
    a statement or assertion of verified information about something that is the case or has happened
    “he supported his argument with an impressive array of facts
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    book, record, record book
    a compilation of the known facts regarding something or someone
    basics, rudiments
    a statement of fundamental facts or principles
    index, index number, indicant, indicator
    a number or ratio (a value on a scale of measurement) derived from a series of observed facts; can reveal relative changes as a function of time
    a book in which the log is written
    won-lost record
    (sports) a record of win versus losses
    card, scorecard
    (golf) a record of scores (as in golf)
    BMI, body mass index
    a measure of someone's weight in relation to height; to calculate one's BMI, multiply one's weight in pounds and divide that by the square of one's height in inches; overweight is a BMI greater than 25; obese is a BMI greater than 30
    business index
    a statistical compilation that provides a context for economic or financial conditions
    leading indicator
    one of 11 indicators for different sections of the economy; used by the Department of Commerce to predict economic trends in the near future
    price index, price level
    an index that traces the relative changes in the price of an individual good (or a market basket of goods) over time
    short account
    the aggregate of short sales on an open market
    stock index, stock market index
    index based on a statistical compilation of the share prices of a number of representative stocks
    type of:
    info, information
    a message received and understood
  3. noun
    an event known to have happened or something known to have existed
    “your fears have no basis in fact
    “how much of the story is fact and how much fiction is hard to tell”
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    type of:
    realism, reality, realness
    the state of being actual or real
  4. noun
    a concept whose truth can be proved
    “scientific hypotheses are not facts
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    type of:
    concept, conception, construct
    an abstract or general idea inferred or derived from specific instances
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