Meaning is related to Good. Good is related to Fair. Fair is related to Condition. Condition is related to Fever. 
Irony is derived from Iron. Iron is related to Decrease. 
Meaning <--RelatedTo--> Good <--RelatedTo--> Fair <--RelatedTo--> Condition <--RelatedTo--> Fever 
Irony --DerivedFrom--> Iron <--RelatedTo--> Decrease 