This is the 810th most frequent Finnish word.
äiti
Mother.
The word 'äiti' is used here as the subject of the sentence, indicating the person performing the action, and it appears in its nominative case form.
Äiti leipoi meille herkullisen omenapiirakan.
Mother baked us a delicious apple pie.
The word 'äiti' appears in its possessive form 'äidilleni', with a possessive suffix indicating 'to my mother' and in the allative case to show the direction of the action.
Soitin äidilleni kertoakseni uutiset.
I called my mother to tell her the news.
The word 'äiti' is used generically to refer to 'mother,' and its form adapts to 'äitiä' in the partitive case as the object of the verbs.