Adjective
1. definite but not specified or identified;
"set aside a certain sum each week""to a certain degree""certain breeds do not make good pets""certain members have not paid their dues""a certain popular teacher""a certain Mrs. Jones"2. having or feeling no doubt or uncertainty; confident and assured;
"felt certain of success""was sure (or certain) she had seen it""was very sure in his beliefs""sure of her friends"3. established beyond doubt or question; definitely known;
"what is certain is that every effect must have a cause""it is certain that they were on the bus""his fate is certain""the date for the invasion is certain"4. certain to occur; destined or inevitable;
"he was certain to fail""his fate is certain""In this life nothing is certain but death and taxes"- Benjamin Franklin"he faced certain death""sudden but sure regret""he is sure to win"5. established irrevocably;
"his fate is sealed"6. capable of being depended on;
"a quick and certain remedy""a sure way to distinguish the two""wood dust is a sure sign of termites"7. exercising or taking care great enough to bring assurance;
"be certain to disconnect the iron when you are through""be sure to lock the doors"