[ 'sə:t(ə)n , -tɪn ]
■ adjective
1》 able to be firmly relied on to happen or be the case.
2》 completely convinced of something.
3》 specific but not explicitly named or stated: ~ problems.
↘not known to the reader or hearer: a ~ Mr Percy.
■ pronoun ( ~ of ) some but not all.
Phrases
for ~ without any doubt.
make ~ take action to ensure that something happens.
↘establish whether something is definitely correct.
Origin
ME: from OFr., based on L. certus 'settled, sure'.