The Collaborative International Dictionary of English v.0.48:
Second \Sec"ond\, v. t. [imp. & p. p. Seconded; p. pr. & vb.
n. Seconding.] [Cf. F. seconder, L. secundare, from
secundus. See Second, a.]
1. To follow in the next place; to succeed; to alternate.
In the method of nature, a low valley is immediately
seconded with an ambitious hill. --Fuller.
Sin is seconded with sin. --South.
2. To follow or attend for the purpose of assisting; to
support; to back; to act as the second of; to assist; to
forward; to encourage.
We have supplies to second our attempt. --Shak.
In human works though labored on with pain,
A thousand movements scarce one purpose gain;
In God's, one single can its end produce,
Yet serves to second too some other use. --Pope.
3. Specifically, (Parliamentary Procedure) to support, as a
motion or proposal, by adding one's voice to that of
the mover or proposer.
Note: Under common parliamentary rules used by many
organizations, especially legislative bodies, a motion
must be seconded in order to come properly before the
deliberative body for discussion. Any motion for
which there is no second dies for lack thereof.