1 [singular] : something that is second : the second thing in a series ▪ His birthday is on the second of June. [=on June 2] ▪ The win was his second of the year. —see also a close second at ²close
2 seconds [plural] : another serving of food taken after you are finished with the first serving ▪ Who wants seconds?
3 [singular] : a statement made to support or approve a motion in a meeting ▪ There's been a motion to vote on the proposal. Do I hear a second?
4 [count] : a product that is cheaper than normal because it is damaged or imperfect —usually plural ▪ These curtains are seconds. ▪ The store sells factory seconds.
5 [noncount] : the forward gear or speed in a vehicle that is one speed higher than first gear ▪ Put the car/bicycle in second when you go up the hill.
6 [count] Brit : an undergraduate degree of the second highest level from a British university ▪ He took/received a second in history.
7 [noncount] baseball : second base ▪ He stole second. ▪ There's a runner on second.
8 [count] : a person whose job is to help someone who is fighting in a boxing match or duel