رجبية doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has 2 entries for it, distinguished by diacritics. Select one below for the full classical Arabic definition.

• رَجَبِيَّةٌ

  رَجَبِيَّةٌ ذ A victim, (Mgh, TA,) [i. e.] a sheep or goat, (Msb,) which the Arabs used to sacrifice, (Mgh, Msb, TA,) in the Time of Ignorance, to their gods (Msb) in Rejeb, (Mgh, Msb, TA,) the month thus called: (TA:) t…

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• رُجَبِيَّةٌ

  نَخْلَةٌ رُجَبِيَّةٌ ذ A palm-tree having a رُجْبَة to support it; (S, * Mgh in art. عرو and عرى, and K *;) as also رُجَّبِيَّةٌ; each an extr. rel. n., (K, TA,) and the latter the more so. (TA.)…

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