Here is a simple inference definition: an inference is a conclusion you work out from clues, evidence or reasoning, rather than something stated to you outright. If you walk into a kitchen, smell burnt toast and see smoke near the toaster, you do not need anyone to tell you what happened. You draw an inference.
The inference meaning in English covers both the act of reasoning ("by inference") and the conclusion you reach ("a reasonable inference"). Teachers ask for inferences in reading tests, scientists make them from data, and judges weigh them in court. This page explains each use, gives examples, and settles the infer versus imply mix up.
Entry at a glance
Meaning
A conclusion reached from evidence and reasoningPart of speech
Noun (countable and uncountable)Pronunciation
IN-fuh-ruhns (stress on the first syllable)Word forms
infer (verb), inferred, inferring, inferential (adjective)Origin
Medieval Latin inferentia, from Latin inferre, "to bring in"; English since the 1590sClose words
deduction, conclusion, assumption, reasoningRegister
Neutral; common in school, science, logic and law
Inference definition, step by step
When teachers define inference, they usually break it into three parts:
- What you observe: facts, words, data or clues in front of you.
- What you already know: background knowledge about how the world usually works.
- What you conclude: the idea you build by combining the two.
For example, your colleague arrives soaked and holding a closed umbrella that will not open. You observe the water and the broken umbrella; you know umbrellas keep people dry; you infer it broke on the way and she got caught in the rain. Nobody said so, yet the conclusion is sensible. That middle step, joining evidence to knowledge, is what makes something an inference rather than a guess.
Examples of inference in daily life
- From the empty milk carton in the fridge, Dad drew the inference that the kids had been up late again.
- The report never mentions profit, and readers made the obvious inference that the year had gone badly.
- By inference, the detective worked out that the thief knew the alarm code.
- My inference from his short replies was that he was busy, not angry.
- The study's authors warn against drawing broad inferences from such a small sample.
Inference in reading and writing
In school, an inference question asks what the text suggests but does not state. To answer well:
- Find the clue words in the passage, such as actions, feelings or details of setting.
- Ask what those clues usually mean in real life.
- State your conclusion and point back to the evidence: "I can infer that... because the text says..."
Writers rely on readers making inferences. Showing a character's shaking hands instead of saying "he was nervous" trusts the reader to infer the feeling. Devices like allusion and irony also depend on it. Our grammar and writing section has more terms that work this way.
Inference in logic, science and statistics
Logicians separate two broad kinds:
| Type | How it works | Strength |
|---|---|---|
| Deductive | From general rules to a specific case: all metals conduct electricity; copper is a metal; so copper conducts. | If the starting facts are true, the conclusion must be true. |
| Inductive | From many specific cases to a general pattern: the sun has risen every day, so it will rise tomorrow. | Likely but not guaranteed. |
In statistics, statistical inference means using a sample to estimate facts about a larger group, such as polling a thousand voters to estimate the views of millions. In computing, inference also names the step where a trained model makes a prediction on new data. Scientists test inferences by forming a hypothesis and checking it.
Infer versus imply
This is the classic confusion. The speaker or writer implies; the listener or reader infers.
- "Are you implying I am late?" means: are you hinting it?
- "I inferred from her tone that she was upset" means: I worked it out.
Some speakers use infer to mean imply, and it has a long history, but many teachers and editors still mark it as an error, so keep them apart in formal writing. A related word is inference versus implication: an implication is what is suggested; an inference is what someone concludes from it.
Latin roots and neighbouring ideas
Medieval Latin inferentia is the source, borrowed during the 1590s. Its root verb, Latin inferre, joins in with ferre, "to carry", so to infer is to carry one idea in from another. At first inference named the act of inferring; by the 1610s it also meant the conclusion itself.
Do not confuse it with an assumption, which you accept without evidence, or a guess, which may have no reasoning at all. A sound inference always points back to something you can show.
Frequently asked questions
Is there a short definition of inference?
An inference is a conclusion you reach by thinking about evidence and what you already know. It is what you figure out, as opposed to what you are told directly.
What is the difference between inference and observation?
An observation is what you notice with your senses, such as wet streets. An inference is what you conclude from it, such as that it rained overnight.
Is inference the same as a guess?
No. A guess may have little basis. An inference is supported by clues and reasoning, so you can explain why you reached it, even if it later turns out to be wrong.
How do you pronounce inference?
Say IN-fuh-ruhns, stressing the first syllable. The verb infer moves the stress to the end: in-FUR.
What is the plural of inference?
Inferences. For example, a careful reader can draw several inferences from one paragraph.
What is a statistical inference?
It is a conclusion about a whole population based on data from a sample, along with a measure of how uncertain that conclusion is. Surveys and clinical trials both rely on it.