1) Adjective for Hawaii 2) Being one of 50 equal parts 3) Golden anniversary 4) Next after the forty-ninth 5) Ordinal 
• (n.) One of fifty equal parts; the quotient of a unit divided by fifty. • (a.) Next in order after the forty-ninth; -- the ordinal of fifty. • (a.) Consisting of one of fifty equal parts or divisions.
Fif'ti·eth adjective [ Anglo-Saxon fīftigoða . See Fifty .] 1. Next in order after the forty-ninth; -- the ordinal of fifty. 2. Consisting of one of fifty equal parts or divisions. Fif'ti·eth noun One of fifty equal parts; the quotient of a unit divided by fifty. 
[adj] - the ordinal number of fifty in counting order 2. [n] - position 50 in a countable series of things
50th adjective the ordinal number of fifty in counting order
next after the forty-ninth; being the ordinal number for 50. · being one of 50 equal parts.