Predict, Forecast and Prophesy Are Three Different Claims
To predict is to say what will happen. Forecasting adds probability, and prophecy adds authority, which is why the words are not interchangeable.
To predict is to state in advance what will happen. Three related words make different claims. A prediction asserts an outcome; a *forecast* gives a probability and expects to be wrong sometimes; a *prophecy* claims special authority. Weather services forecast precisely because they are honest about uncertainty.
- To say what will happen. *Economists predict slower growth.*
- To state as a consequence of a theory. *The model predicts a shift.*
Word forms
| Form | Word | Example |
|---|---|---|
| Verb | predict | Predict the result. |
| Past | predicted | As predicted. |
| Noun | prediction | A bold prediction. |
| Adjective | predictable | A predictable ending. |
| Adverb | predictably | Predictably, it rained. |
How it is used in a sentence
- Nobody predicted the result.A common line after elections.
- The theory predicts a measurable shift.Science: a testable consequence.
- His reaction was entirely predictable.Often a criticism.
Ways of saying what comes next
- Predict — assert an outcome
- Forecast — give a probability, expecting error
- Project — extend a trend forward under stated assumptions
- Prophesy — foretell with claimed authority
- Anticipate — prepare for, not merely expect
From Latin *praedicere*, to say beforehand, from *prae*, before, and *dicere*, to say — the same verb as in *dictate*, *verdict* and *contradict*.
Predict or forecast?
A forecast usually carries a probability and a time frame. A prediction is a plainer assertion that something will happen.
Prophesy or prophecy?
Prophesy with an s is the verb; prophecy with a c is the noun. The same pattern as practise and practice in British English.