This is the 749th most frequent Finnish word.
liittyen
"Liittyen" means "related to" or "concerning."
In this sentence, 'liittyen' functions as a postposition that connects the noun 'matkasuunnitelmiin' (to travel plans) with the verb 'kysyi' (asked), indicating the topic or context of the question - 'related to'.
Hän kysyi kysymyksen liittyen matkasuunnitelmiin.
He asked a question related to travel plans.
Here, 'liittyen' introduces the relationship between 'työtilaisuuteen' (a job opportunity) and the reception of the letter, specifying the content or focus of the correspondence - 'regarding'.
Sain kirjeen liittyen työtilaisuuteen.
I received a letter regarding a job opportunity.
In this context, 'liittyen' connects 'projektiin' (to the project) with 'tietoja' (information), clarifying what the information is about - 'concerning'.