The Collaborative International Dictionary of English v.0.48:

Planetary \Plan"et*a*ry\, a. [Cf. L. planetarius an astrologer,
   F. plan['e]taire planetary. See Planet.]
   1. Of or pertaining to the planets; as, planetary
      inhabitants; planetary motions; planetary year.
      [1913 Webster]

   2. Consisting of planets; as, a planetary system.
      [1913 Webster]

   3. (Astrol.) Under the dominion or influence of a planet.
      "Skilled in the planetary hours." --Drayton.
      [1913 Webster]

   4. Caused by planets. "A planetary plague." --Shak.
      [1913 Webster]

   5. Having the nature of a planet; erratic; revolving;
      wandering. "Erratical and planetary life." --Fuller.
      [1913 Webster]

   Planetary days, the days of the week as shared among the
      planets known to the ancients, each having its day.
      --Hutton.

   Planetary nebula, a nebula exhibiting a uniform disk, like
      that of a planet.
      [1913 Webster]

WordNet (r) 3.0 (2006):

planetary
    adj 1: of or relating to or resembling the physical or orbital
           characteristics of a planet or the planets; "planetary
           motion"; "planetary year" [syn: planetal, planetary]
    2: of or relating to or characteristic of the planet Earth or
       its inhabitants; "planetary rumblings and eructations"-
       L.C.Eiseley ; "the planetary tilt"; "this terrestrial ball"
       [syn: planetary, terrestrial]
    3: having no fixed course; "an erratic comet"; "his life
       followed a wandering course"; "a planetary vagabond" [syn:
       erratic, planetary, wandering]
    4: involving the entire earth; not limited or provincial in
       scope; "global war"; "global monetary policy"; "neither
       national nor continental but planetary"; "a world crisis";
       "of worldwide significance" [syn: global, planetary,
       world(a), worldwide, world-wide]

Moby Thesaurus II by Grady Ward, 1.0:

118 Moby Thesaurus words for "planetary":
   Antaean, Cynthian, aberrant, aberrative, all-comprehending,
   all-comprehensive, all-covering, all-embracing, all-encompassing,
   all-filling, all-including, all-inclusive, all-pervading, allover,
   anagalactic, asteroidal, astral, astrologic, astrologistic,
   astrologous, astronomic, astrophysical, catholic, celestial,
   circuitous, circumplanetary, cislunar, colossal, cosmic,
   cosmopolitan, country-wide, cyclopean, departing, desultory,
   deviant, deviating, deviative, deviatory, devious, digressive,
   discursive, ecumenic, ecumenical, elephantine, empyreal, empyrean,
   enormous, equinoctial, errant, erratic, excursive, extragalactic,
   galactic, gigantic, global, heaven-wide, heavenly, heliacal,
   immense, indirect, intercosmic, international, interplanetary,
   intersidereal, interstellar, jumbo, labyrinthine, lunar, lunary,
   lunate, lunular, lunulate, mazy, meandering, meteoric, meteoritic,
   monumental, national, nebular, nebulose, nebulous,
   nondenominational, nonsectarian, out-of-the-way, planetal,
   planetarian, planetesimal, rambling, roving, semilunar, serpentine,
   shifting, sidereal, snaky, solar, sphery, star-spangled,
   star-studded, starry, stellar, stellary, stray, swerving,
   terrestrial, total, turning, twisting, undirected, universal,
   uranic, vagrant, veering, wandering, winding, world-wide,
   worldwide, zigzag, zodiacal