'Single' in the Bible

And Jacob served seven years for Rachel; and they were in his eyes as single days, because he loved her.

After whom is the king of Israel come out? after whom dost thou pursue? after a dead dog, after a single flea.

And now, let not my blood fall to the earth far from the face of Jehovah; for the king of Israel is come out to seek a single flea, as when they hunt a partridge on the mountains.

The lamp of the body is the eye; if therefore thine eye be single, thy whole body will be light: