'Second' in the Bible

There is one alone, and there is not a second; yea, he hath neither child nor brother: yet is there no end of all his labour; neither is his eye satisfied with riches; neither saith he, For whom do I labour, and bereave my soul of good? This is also vanity, yea, it is a sore travail.

For if they fall, the one raiseth up his companion, but woe to the one who falleth and there is not a second to raise him up!

I considered all the living which walk under the sun, with the second child that shall stand up in his stead.