This is the 5572nd most frequent Russian word.
посвятить
"To dedicate" or "to devote."
In this sentence, 'посвятить' means 'to dedicate', signifying devoting one's time or energy to someone or something.
Я решил посвятить этот день семье.
I decided to dedicate this day to my family.
Here, 'посвятить' in its past participle form 'посвящён' conveys being dedicated or devoted to a field or pursuit.
Он посвящён науке и постоянно изучает что-то новое.
He is devoted to science and is constantly learning something new.
In this case, 'посвятила' refers to dedicating a work or achievement formally to someone.