Definitions

1. noun

the act of taking something for granted, without having sufficient evidence or proof

“Her assumption about the company’s financial situation turned out to be incorrect.”

2. noun

a thing that is supposed or believed to be true or existing

“The discovery of water on Mars challenged the assumption that the planet was a barren world.”

3. noun

a person’s act of taking on responsibility for something without being asked

“He took it upon himself to assume leadership of the project when the manager stepped down.”

4. verb

to take something for granted, or suppose or believe something to be true

“The researchers assumed that the data was accurate before analyzing it.”

5. verb

to take on or accept responsibility for something

“She assumed the role of team captain after the previous one retired.”