When you ensure that something will happen, you guarantee it. All that homework will ensure that you have no time for fun this afternoon!
Ensure comes from the Old French en- "make" plus seur "sure," and that is exactly what it means today - "to make sure or certain, to guarantee." If you ensure success or someone's safety, you are guaranteeing it. Make sure you can really come through with something before you ensure it!
v make certain of
v be careful or certain to do something; make certain of something
check, check off, mark, mark off, tick, tick off
put a check mark on or near or next to
verify by consulting a source or authority
ascertain, check, determine, find out, learn, see, watch
find out, learn, or determine with certainty, usually by making an inquiry or other effort
check or regulate (a scientific experiment) by conducting a parallel experiment or comparing with another standard
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read for errors
verify by using a duplicate register for comparison
check once more to be absolutely sure
check out conflicting sources; crosscheck facts, for example
make sure of
ask someone for identification to determine whether he or she is old enough to consume liquor
pick out random samples for examination in order to ensure high quality
maintain a check on; especially by patrolling
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confirm the truth of