Inside the Universes

'ascertain'

[see.v.10] as in: be careful or certain to do something; make certain of something

Examples:
He verified that the valves were closed
See that the curtains are closed
control the quality of the product

'ascertain'

[determine.v.08] as in: find out, learn, or determine with certainty, usually by making an inquiry or other effort

Examples:
I want to see whether she speaks French
See whether it works
find out if he speaks Russian
Check whether the train leaves on time

'ascertain'

[ascertain.v.04] as in: learn or discover with certainty

Origins

					ascertain (English)
└── acertener (Old French (842-ca. 1400))
    ├── a- (Old French (842-ca. 1400))
    │   └── ad (Latin)
    └── certener (Old French (842-ca. 1400))