1. 
2. 
[syn: individually, separately, singly, severally, one by one, on an individual basis]
The Collaborative International Dictionary of English v.0.48:
Singly \Sin"gly\, adv.
   1. Individually; particularly; severally; as, to make men
      singly and personally good.
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   2. Only; by one's self; alone.
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            Look thee, 't is so! Thou singly honest man. --Shak.
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   3. Without partners, companions, or associates;
      single-handed; as, to attack another singly.
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            At omber singly to decide their doom. --Pope.
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   4. Honestly; sincerely; simply. [R.] --Johnson.
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   5. Singularly; peculiarly. [Obs.] --Milton.
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WordNet (r) 3.0 (2006):
singly
    adv 1: one by one; one at a time; "they were arranged singly"
           [ant: multiply]
    2: apart from others; "taken individually, the rooms were, in
       fact, square"; "the fine points are treated singly" [syn:
       individually, separately, singly, severally, one by
       one, on an individual basis]