Webster's Revised Unabridged Dictionary · 1913

Eigne

Eigne , adjective

[Old French aisné, ainsné, French aîné, from Latin ante natus born before. Compare Esnecy.]

1.
(Law) Eldest; firstborn. — Blackstone
2.
Entailed; belonging to the eldest son. [Obsolete]
Collocations (1)
Bastard eigne , a bastard eldest son whose parents afterwards intermarry.