The ordinal number of one hundred twenty in counting order(adjective)
WordNet. Princeton University. 2010.
Use "120th" in a sentence
"Thus, the 3rd North Carolina Infantry, with whom I had the honor to serve, was inducted into service of the United States and was thereafter known as the 120th Infantry of the 30th Division."
"The fourth largest precinct is the 120th, which is 14 square miles. rss"
"The fourth largest precinct is the 120th, which is 14 square miles."