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The word is credo from which we get the word creed.
I believe in you = Tibi credo
To believe = Credere
In te ipsum crede!"
credere = to believe
Credere (To believe): Credo - I believe. Credes - You believe. Credet - He/she/it believes. Credemus - We believe. Credetis - You (plural) believe. Credent - They …believe.
'credo' (cred-o, cred-ere) = I believe (credence, credulous, creed)
The Latin word for believe is credo, credere. We get the word "credit" from it.
Latin fidere, meaning 'trust, believe, be loyal'. Latin credere, menaing 'believe'.
The term used in Christian Latin is credens, which is the present participle of the verb credere, "to believe". It means literally "believing [person]". In the plural (credent…es) it's the equivalent of the English collective noun "the faithful". There is also the word acceptor, literally "one who receives" but used, at least in pre-Classical times (e.g., by the playwright Titus Macchius Plautus), to mean "one who accepts [something] as true". This word does not have specifically religious connotations. However, it may be worth noting that acceptor suffered a change in Christian Latin, where it came to mean "one who favors [someone] unjustly".
The Latin root that means believe is cred. Some words that include this root are credere "believe", credit "believes", credo "I believe", credidi "I believed", and creditum …"loan", which arises from the idea that the person who is loaning the money believes in the recipient's ability to repay it. In English, the recipient is said to have credibility.
fides is the latin word for belive Fides translates to faith. It can also mean belief, but if you're looking for the verb, believe, you're looking for credo, credere, credidi,… creditus. The first person, singular conjugation, credo - I believe, is where we get the English word, creed.