Seventh/ˈsevnθ/ Definition 1 of 3Pro Tip 1/3Ordinal Usage Used to describe position in an ordered sequence, especially dates and rankings. Her birthday is on the seventh of May. Pro Tip 2/3Cultural Reference In some cultures, the 'seventh' milestone is celebrated, as in a child's seventh birthday. In his culture, turning seven is very special. Pro Tip 3/3Common Expressions 'Seventh heaven' is an idiom for a state of extreme happiness. She was in seventh heaven after winning the award.