Origin: Latin suffix -tion
Assumption has 9 different meanings across 2 categories:
a statement that is assumed to be true and from which a conclusion can be drawn
"on the assumption that he has been injured we can infer that he will not play"
a hypothesis that is taken for granted
"any society is built upon certain assumptions"
the act of taking possession of or power over something
"his assumption of office coincided with the trouble in Cuba"
"the Nazi assumption of power in 1934"
"he acquired all the company's assets for ten million dollars and the assumption of the company's debts"
celebration in the Roman Catholic Church of the Virgin Mary's being taken up into heaven when her earthly life ended; corresponds to the Dormition in the Eastern Orthodox Church
"The feast day marked a solemn assumption, celebrating the belief that the Virgin Mary was bodily taken up into heaven at the end of her earthly life."
(Christianity) the taking up of the body and soul of the Virgin Mary when her earthly life had ended
"The church celebrated today as the day of the Assumption, honoring the belief that Mary was taken bodily into heaven at the end of her life."
audacious (even arrogant) behavior that you have no right to
"he despised them for their presumptuousness"
the act of assuming or taking for granted
"your assumption that I would agree was unwarranted"
The act of assuming, or taking to or upon oneself; the act of taking up or adopting.
"Her assumption of leadership came after years of quietly guiding the team through every challenge."
In plain English: An assumption is something you believe to be true without having any proof for it yet.
"His assumption that everyone would show up on time caused several delays when people were late."
Usage: Use this word when referring to an idea accepted as true without proof rather than the physical action of putting on clothing or equipment. Avoid confusing it with "assumption" in legal contexts where one party takes responsibility for a debt, which is better expressed as assuming liability.
The Assumption of Mary, the mother of Jesus, into heaven, a Catholic dogma.
"The Feast of the Assumption celebrates the belief that Mary was taken bodily into heaven by God."
The word assumption comes from Middle English via Medieval Latin, where it originally meant "a taking up," specifically referring to being taken into heaven. It entered modern usage as the noun form related to the verb assume.