(1):

(adv.) Without partners, companions, or associates; single-handed; as, to attack another singly.

(2):

(adv.) Honestly; sincerely; simply.

(3):

(adv.) Singularly; peculiarly.

(4):

(adv.) Individually; particularly; severally; as, to make men singly and personally good.

(5):

(adv.) Only; by one's self; alone.