Origin: Latin suffix -ive
Supportive has 2 different meanings across 1 category:
furnishing support or assistance
"a supportive family network"
"his family was supportive of his attempts to be a writer"
Providing support.
"The coach was very supportive during the player's difficult injury recovery."
The word supportive is formed by adding the suffix "-ive" to the base word support. This construction simply indicates that something has the quality of providing support.