Second has 22 different meanings across 4 categories:
the fielding position of the player on a baseball team who is stationed near the second of the bases in the infield
"The shortstop threw to second for the out, completing a perfect double play."
the official attendant of a contestant in a duel or boxing match
"The referee stopped the fight to let both seconds adjust their fighters' gloves and check for any cuts before resuming the round."
the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle
"he had to shift down into second to make the hill"
Something that is number two in a series.
"The second grabbed the hilt of his master's sword to steady it before the fatal blow was struck."
One-sixtieth of a minute; the SI unit of time, defined as the duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of caesium-133 in a ground state at a temperature of absolute zero and at rest.
One who supports another in a contest or combat, such as a dueller's assistant.
In plain English: A second is a very short unit of time that you can count on a clock.
"Please give me a second while I tie my shoes."
Usage: Use "second" exclusively for precise scientific or technical contexts involving time measurement; avoid it when referring to general duration, which should instead use terms like "instant." This specific noun is almost always found with modifiers indicating exact measurements rather than in casual conversation about moments passing quickly.
transfer an employee to a different, temporary assignment
"The officer was seconded for duty overseas"
To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (See under [[#Etymology 3]] for translations.)
"After the strike at the main factory, many workers were seconded to the nearby assembly plant for a few weeks until production resumed."
To transfer temporarily to alternative employment.
In plain English: To second something means to support or agree with what someone else has said.
"She asked her husband to second her motion at the meeting."
a part or voice or instrument or orchestra section lower in pitch than or subordinate to the first
"second flute"
"the second violins"
Number-two; following after the first one with nothing between them. The ordinal number corresponding to the cardinal number two.
"She took the second seat in the row, right behind her best friend."
In plain English: Second means coming right after first in order or importance.
After the first; at the second rank.
"After the initial round of interviews, she was offered a position as the second candidate to start next Monday."
In plain English: Second means doing something only after someone else has already done it.
"I will see you in a second."
The word "second" comes from the Latin secundus, meaning "following" or "next in order." It entered English via Old French, eventually replacing earlier native terms like "twoth" and "other" when referring to rank or sequence.