What does the dictionary of synonyms and antonyms mean

Synonyms are words that have the same meaning. Antonyms are words that mean the opposite of each other.

according to the college board, the average cost of tuition and fees for the 2017–2018 school year was $34,740 at private colleges, $9,970 for state residents at public colleges, and $25,620 for out-of-state residents attending public universities.