noun

1. Something that is number two in a series.

2. Something that is next in rank, quality, precedence, position, status, or authority.

3. The place that is next below or after first in a race or contest.

Synonyms: seconder

verb

1. To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (See under #Etymology 3 for translations.)

   “I second the motion.”

2. To follow in the next place; to succeed.

3. To climb after a lead climber.

adjective

1. Number-two; following after the first one with nothing between them. The ordinal number corresponding to the cardinal number two.

   “He lives on Second Street.”

2. Next to the first in value, power, excellence, dignity, or rank; secondary; subordinate; inferior.

3. Being of the same kind as one that has preceded; another.

   “Residents of Texas prepared for Hurricane Harvey, which would in some ways turn out to become the second Hurricane Katrina.”

Synonyms: twoth, other

adverb

1. (with superlative) After the first; at the second rank.

   “Saturn is the second largest planet.”

2. After the first occurrence but before the third.

   “He is batting second today.”