A second portion of the same thing, usually of food; seconds; refill.

(sports, chiefly baseball, of a team or club) Being in the second division (the bottom half of the standings).

(US, chiefly baseball, dated) The half of the standings containing the teams with the worst records.

(physics) A unit equal to a joule multiplied by a second, used to measure action or angular momentum.

(derogatory) A person who is primarily concerned with being esteemed and valued by others, at the expense of forming his/her own independent worldview. A person who derives their decisions from the worldview of others; with the sole metric of merit based off of how others will receive and accept their decision not based on merit or truth but on popular perception.

plural of second-hander

A female first cousin of one's mother or father.

(historical) A female house-servant responsible for relatively light work, such as chamber-work or waiting at table.

(fine art) That part of a picture between the foreground and the background; the middle distance.

Penultimate, next to last, immediately preceding the end of a sequence, list, etc.