The Collaborative International Dictionary of English v.0.48:

Sociable \So"cia*ble\, n.
   1. A gathering of people for social purposes; an informal
      party or reception; as, a church sociable. [Colloq. U. S.]
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   2. A carriage having two double seats facing each other, and
      a box for the driver. --Miss Edgeworth.
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The Collaborative International Dictionary of English v.0.48:

Sociable \So"cia*ble\, a.[F., fr. L. sociabilis, fr. sociare to
   associate, fr. socius a companion. See Social.]
   1. Capable of being, or fit to be, united in one body or
      company; associable. [R.]
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            They are sociable parts united into one body.
                                                  --Hooker.
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   2. Inclined to, or adapted for, society; ready to unite with
      others; fond of companions; social.
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            Society is no comfort to one not sociable. --Shak.
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            What can be more uneasy to this sociable creature
            than the dry, pensive retirements of solitude?
                                                  --South.
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   3. Ready to converse; inclined to talk with others; not
      taciturn or reserved.
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   4. Affording opportunites for conversation; characterized by
      much conversation; as, a sociable party.
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   5. No longer hostile; friendly. [Obs.] --Beau. & Fl.
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   Sociable bird, or Sociable weaver (Zool.), a weaver bird
      which builds composite nests. See Republican, n., 3.
      (b) .
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   Syn: Social; companionable; conversible; friendly; familiar;
        communicative; accessible.
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WordNet (r) 3.0 (2006):

sociable
    adj 1: inclined to or conducive to companionship with others; "a
           sociable occasion"; "enjoyed a sociable chat"; "a
           sociable conversation"; "Americans are sociable and
           gregarious" [ant: unsociable]
    2: friendly and pleasant; "a sociable gathering"
    n 1: a party of people assembled to promote sociability and
         communal activity [syn: sociable, social, mixer]