This is the 16864th most frequent Russian word.
совершена
"Совершена" means "accomplished" or "completed" in English.
The word 'совершено' is used in its past passive participle form to indicate an action that has been completed, referring here to the crime being committed.
Преступление было совершено ночью.
The crime was committed at night.
In this sentence, 'совершила' is the past tense form of the verb, showing that the heroic act was carried out by her.
Она совершила героический поступок.
She performed a heroic deed.
Here, 'совершена' is employed in the past passive participle form, emphasizing the finalization or realization of the dream.