Supposedly lucky number (5)

I believe the answer is:
seven
(Other definitions for seven that I've seen before include "So many ages of man (AYLI)" , "- Against Thebes (Aeschylus)" , "Numeral" , "See 1" , "Number of colours of the rainbow" .)
I believe the answer is:
seven
(Other definitions for seven that I've seen before include "So many ages of man (AYLI)" , "- Against Thebes (Aeschylus)" , "Numeral" , "See 1" , "Number of colours of the rainbow" .)