|Noah Webster's Dictionary|
1. (adv.) In a singular manner; in a manner, or to a degree, not common to others; extraordinarily; as, to be singularly exact in one's statements; singularly considerate of others.
2. (adv.) Strangely; oddly; as, to behave singularly.
3. (adv.) So as to express one, or the singular number.
Singularly (1 Occurrence)
Numbers 6:2 Speak unto the sons of Israel, and thou hast said unto them, When a man or woman doeth singularly, by vowing a vow of a Nazarite, to be separate to Jehovah; (YLT)