|Noah Webster's Dictionary|
1. (a.) Separate or apart from others; single; distinct.
2. (a.) Engaged in by only one on a side; single.
3. (a.) Existing by itself; single; individual.
4. (a.) Each; individual; as, to convey several parcels of land, all and singular.
5. (a.) Denoting one person or thing; as, the singular number; -- opposed to dual and plural.
6. (a.) Standing by itself; out of the ordinary course; unusual; uncommon; strange; as, a singular phenomenon.
7. (a.) Distinguished as existing in a very high degree; rarely equaled; eminent; extraordinary; exceptional; as, a man of singular gravity or attainments.
8. (a.) Departing from general usage or expectations; odd; whimsical; -- often implying disapproval or censure.
9. (a.) Being alone; belonging to, or being, that of which there is but one; unique.
10. (n.) An individual instance; a particular.
11. (n.) The singular number, or the number denoting one person or thing; a word in the singular number.
Int. Standard Bible Encyclopedia
sin'-gu-lar: "Pertaining to the single person," "individual," and so sometimes "unusual," "remarkable." So The Wisdom of Solomon 14:18, the King James Version "the singular diligence of the artificer" (philotimia, "love of honor," the Revised Version (British and American) "ambition"). In Leviticus 27:2 by "when a man shall make a singular vow" the King James Version seems to have understood a "personal" or "private" vow. the Revised Version (British and American) has "accomplish a vow," with margin "make a special vow." Compare the same phrase (yaphli' (yephalle') nedher) used of the Nazirite vow in Numbers 6:2.
Singular (2 Occurrences)
Leviticus 27:2 Speak unto the children of Israel, and say unto them, When a man shall make a singular vow, the persons shall be for the LORD by thy estimation. (KJV WBS)
Ezekiel 7:5 Thus saith the Lord Jehovah: An evil, an only evil; behold, it cometh. (See JPS)