simple past tense and past participle of decide
"She decided to stay home instead of going to the party last night."
In plain English: To decide means to make up your mind about what you want to do after thinking about your options.
"She decided to order pizza for dinner."
Usage: Use "decided" to describe an action that was completed in the past or to modify another verb when indicating a resolved state. Do not use it for present-tense situations unless you are specifically referring to a decision made earlier that still applies now.
determined; resolute
"She decided to finish the marathon even though her legs were aching from exhaustion."
In plain English: Decided means having a clear opinion or choice about something without any doubt.
"The decided advantage belonged to the team that practiced every day."
Usage: Use "decided" as an adjective to emphasize that something is distinct, definite, or easily noticeable, such as in a decided advantage or a decided difference. Do not use it to describe a person's personality traits like being determined or resolute.
Derived from Latin decidere (to cut off), it originally meant to make a final determination by cutting away alternatives. The past participle form evolved in English to describe having reached such a firm conclusion or being resolved.