'Single' in the Bible

I say this to put you to shame. Has it come to this, that there does not exist among you a single wise man competent to decide between a man and his brother,

But I say to the unmarried and to the widows, [that as a practical matter] it is good if they remain [single and entirely devoted to the Lord] as I am.

(but even if she does leave him, let her remain single or else be reconciled to her husband) and that the husband should not leave his wife.

Let us not commit sexual immorality as some of them did, and in a single day 23,000 people fell dead.

For just as the body is one and yet has many parts, and all the parts of the body, though many, form a single body, so it is with the Messiah.

For in fact the body is not a single member, but many.

If they all were a single organ, where would [the rest of] the body be?

But now [as things really are] there are many parts [different limbs and organs], but a single body.