a.

1. 第二的；第二次的
   She lives on the second floor.

   她住在二楼。

2. 二等的，次等的
3. 次要的，副的，从属的
   He plays second fiddle to Mr. White.

   他充当怀特先生的副手。

4. 另一的，附加的
   It is not likely that you will be given a second opportunity.

   人家不大可能再给你一次机会。

ad.

1. 居第二位
   The American swimmer came second.

   美国游泳选手得第二。

2. 第二，其次

n.

1. 第二名，第二位，二等奖[the S]
   I got a second in the speech contest.

   我在演讲比赛中得了第二名。

2. 另一人（或物）[C]
3. （决斗等的）助手；支持人[C]
4. 二等品；次品[P1]
   These gloves are seconds.

   这些手套是二流货。

5. （食物的）第二份[P]

vt.

1. 支持，赞同
   His view was seconded by many experts.

   他的观点受到许多专家的支持。

n.

1. （时间、角度的）秒[C]
2. 瞬间，片刻[S]
   She'll be back in a second.

   她一会儿就回来。

ordinal number

1. constituting number two in a sequence; coming after the first in time or order; 2nd.
   ▸secondly.
   ▸ (seconds) informal a second course or second helping of food at a meal.
   ▸denoting someone or something reminiscent of a better-known predecessor:

   the conflict could turn into a second Vietnam.
2. subordinate or inferior in position, rank, or importance.
   ▸Brit. a place in the second grade in an examination for a university degree.
   ▸Music  performing a lower or subordinate of two or more parts for the same instrument or voice.
   ▸ (seconds) goods of an inferior quality.
   ▸coarse flour, or bread made from it.
3. Music  an interval spanning two consecutive notes in a diatonic scale.
   ▸the note which is higher by this interval than the tonic of a diatonic scale or root of a chord.
4. an attendant assisting a combatant in a duel or boxing match.
5. a Cub or Brownie who assists the Sixer.

v.

1. formally support or endorse (a nomination or resolution) before adoption or further discussion.
   ▸express agreement with.
2. archaic support; back up.

n.

1. (abbrev.: s or ") a sixtieth of a minute of time, which as the SI unit of time is defined in terms of the natural periodicity of the radiation of a caesium-133 atom.
   ▸informal a very short time.
2. (also arc second or second of arc) a sixtieth of a minute of angular distance. (Symbol: ")

v.