Meaning : Reach, make, or come to a decision about something.
Example :
We finally decided after lengthy deliberations.
Synonyms : decide, make up one's mind
Meaning : Fix in scope. Fix the boundaries of.
Example :
The tree determines the border of the property.
Meaning : Settle conclusively. Come to terms.
Example :
We finally settled the argument.
Synonyms : settle, square off, square up
Meaning : Find out, learn, or determine with certainty, usually by making an inquiry or other effort.
Example :
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.