yearling

noun

1. An animal that is between one and two years old; one that is in its second year (but not yet two full years old).

   “a yearling lamb”

   “Tom Fettig and his wife, Kim, were there with 60 yearlings, about half of a herd they were helping their son raise on the outskirts of Bismarck.”

2. A racehorse that is considered to be one year old until a subsequent January 1st.
3. (US)A sophomore at West Point military academy.

   “"But is a plebe forbidden to stroll here?" "If a plebe did have the brass to try it," replied Anstey slowly, "I reckon he would have to fight the whole yearling class in turn."”

   “As a yearling, he admitted to doing his part in ensuring that plebes knew their place at the Academy, […]”