Noun
(US, military, informal) A first-class cadet.
(informal, by extension) Someone who does something for the first time; a debutant
(informal) Someone who is in the first year, or round, of something
Source: en.wiktionary.orgA portion of the original gold is infused with gold from preceding melts to become part of the rings for each 'Firstie' class. citation Thayer Award main West Point is home to the Sylvanus Thayer Award. Source: Internet