This is the 7535th most frequent Russian word.
дмитриевича
"Дмитриевича" is the patronymic form meaning "son of Dmitry" in Russian.
Here, 'Дмитриевича' refers to a person named Dmitrievich, specifically in the accusative case due to the action 'встретил.' It demonstrates the word's use as a proper noun.
Я встретил Дмитриевича на улице.
I met Dmitrievich on the street.
'Дмитриевичем' here is in the instrumental case, indicating the person through or about whom the talking is occurring.
Мы говорили с Дмитриевичем о работе.
We talked with Dmitrievich about work.
In this context, 'Дмитриевичу' appears in the dative case, indicating the recipient of the gift.