Noun
(US, criminal law, informal) [in relation to a specific action] a person who is a member of a specific class for whom the action constitutes a crime; typically the action is possession of a weapon and the class is convicted felons
Used other than figuratively or idiomatically: see certain, person.
Source: en.wiktionary.orgA positive engagement to marry a certain person at a certain time, at all haps and hazards, I have always considered the most ridiculous thing on earth. Jane Welsh Carlyle
Socrates is reported to have replied, when a certain person complained of having received no benefit from his travels: "It serves you right! You travelled in your own company!”. Seneca
If right now our emotional reaction to seeing a certain person or hearing certain news is to fly into a rage or to get despondent or something equally extreme, it's because we have been cultivating that particular habit for a very long time. Pema Chodron
If a man has reported to you, that a certain person speaks ill of you, do not make any defense (answer) to what has been told you: but reply, The man did not know the rest of my faults, for he would not have mentioned these only. (33) [tr. George Long (1888)]. Epictetus
Love meant jumping off a cliff and trusting that a certain person would be there to catch you at the bottom. Jodi Picoult
If you want a certain thing, you must first be a certain person. Once you are that certain person, obtaining that certain thing will no longer be a concern of yours. Zen Proverb