Sentence:  Presumably a cocktail party is expected to fulfill the <WSD>host</WSD> 's desire to get together a number of people who are inadequately acquainted and thereby arrange for bringing the level of acquaintance up to adequacy for future cooperative endeavors . 
Meaning of the word marked with <WSD> tags:  a person who invites guests to a social event (such as a party in his or her own home) and who is responsible for them while they are there