seventh (sevenths plural )
1 ord The seventh item in a series is the one that you count as number seven.
I was the seventh child in a family of 11.
2 fraction A seventh is one of seven equal parts of something. A million people died, a seventh of the population.
Seventh Day Adventist (Seventh Day Adventists plural )
1 adj Seventh Day Adventist churches are churches that believe that Jesus Christ will return very soon, and that have Saturday as their holy day.
2 n-count A Seventh Day Adventist is a member of the Seventh Day Adventist church.
seventh heaven
If you say that you are in seventh heaven, you mean that you are in a state of complete happiness.
INFORMAL n-uncount