·noun Any right, privilege, or possession to which a person is entitled by birth, such as an estate descendible by law to an heir, or civil liberty under a free constitution; ·esp. the rights or inheritance of the first born.
1) This word denotes the special privileges and advantages belonging to the first-born son among the...
Easton's Bible Dictionary
the advantages accruing to the eldest son. These were not definitely fixed in patriarchal times. Gre...
William Smith's Bible Dictionary