Significant is a synonym of Meaning. Meaning is related to Gather. Gather is a type of Pull. Pull is the opposite of Connect. 
Belong is related to Member. Member is a synonym of Term. 
Significant <--Synonym--> Meaning <--RelatedTo--> Gather --IsA--> Pull <--Antonym--> Connect 
Belong <--RelatedTo--> Member <--Synonym--> Term 