This is the 4364th most frequent Japanese word.
友達
Friend.
Here, '友達' (friends) is used to denote people with whom the speaker has a friendly relationship, and the verb '遊びに行く' means going out to play or have fun.
友達と遊びに行きました。
I went out to play with my friends.
In this sentence, '友達' is singular, emphasizing the exclusivity of the person's friendship, indicating a close and unique relationship.
彼は私の唯一の友達です。
He is my only friend.
The word '友達' implies potential new relationships and social connections, highlighting the enjoyment in forming bonds with others.