What mean content?

The Word has more than one meaning, but all are related. It's normally pronounced with the second syllable emphasized: conTENT.

As an adjective it means happy and settled, often in the sense of accepting a situation: He was content with his current job. The dog ate her meal and felt quite content.

As a verb it means to make happy. "A bowl of ice cream would content me." Note this is an uncommon use in modern English.

As a noun it means a state of being satisfied or contented; e.g. "Summer vacation was a time of glorious content".

The plural noun, pronounced with emphasis on the first syllable (CONtents) has a completely different root - "contain" - and refers to what is inside something, usually a package: The box's contents were wrapped in three layers of protective plastic.