hypothesis
- A proposed explanation for an observation or phenomenon that can be tested through further investigation.
- More loosely, any tentative assumption or supposition made as a starting point for reasoning.
In a sentence
- The researcher's hypothesis was that sleep deprivation would significantly impair memory consolidation.
- Let's proceed on the hypothesis that the missing data will not affect the overall results.
Usage note. In scientific usage, a 'hypothesis' is more specific and testable than a 'theory'—a theory has already been supported by substantial evidence, so avoid using the two interchangeably.
Where it comes from
English hypothesis · entered English 16th c.
From Greek 'hypothesis,' meaning 'foundation' or 'supposition,' from 'hypo-' (under) and 'thesis' (placing, proposition), derived from 'tithenai' (to put). It entered English in the 16th century through Latin, initially in philosophical and logical contexts before becoming central to scientific method.