عرصة doesn't appear in Hans Wehr's Modern Standard Arabic dictionary, but Lane's Arabic-English Lexicon has an entry for it. Select the entry below for the full classical Arabic definition.

• عَرْصَةٌ

  عَرْصَةٌ ذ The court, or open area, (سَاحَة,) of a house; (T, Msb;) i. e., a spacious vacant part, or portion, thereof, in which is no building; (Msb;) so called because the children play, or sport, &c., (يَعْتَرِصُونَ,)…

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