Definition of "one-year-old" [one-year-old]

• One year of age (adjective)

WordNet. Princeton University. 2010.

• "The $1.6 billion and now one-year-old venue will be known as MetLife Stadium for at least the next 25 years, with four permanent signs set to be unveiled outside the building by the stadium's Sept. 11 regular-season opener between the Jets and the Cowboys."
• "A former leader of the Conservative Party, Mr. Duncan Smith risks inflaming tensions with coalition partners the Liberal Democrats over immigration policy—a subject which has been one of the most contentious areas for the one-year-old government."
• "EPA A forest official payed tribute to a one-year-old baby calf which was knocked down by a train in Deepor Beel wildlife sanctuary on the outskirts of Guwahati city, northeast India, Wednesday."