1. (

• determine ,
• find ,
• find_out ,
• ascertain ,

) establish after a calculation, investigation, experiment, survey, or study; "find the product of two numbers"; "The physicist who found the elusive particle won the Nobel Prize" ;

2. (

• see ,
• check ,
• insure ,
• see_to_it ,
• ensure ,
• control ,
• ascertain ,
• assure

) be careful or certain to do something; make certain of something; "He verified that the valves were closed"; "See that the curtains are closed"; "control the quality of the product" ;

3. (

• determine ,
• check ,
• find_out ,
• see ,
• ascertain ,
• watch ,
• learn ,

) find out, learn, or determine with certainty, usually by making an inquiry or other effort; "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" ;

4. (

• ascertain ,

) learn or discover with certainty ;