The Ascended Masters assign two associated definitions to this term.
The first defines the Star Seed as a family or soul group whose members
have evolved to Fifth-Dimensional awareness. Star Seeds can also contain
members who have not yet evolved to this level and are still
incarnating on earth. The second definition of Star Seed is somewhat
literal and refers to populating groups, or soul groups, originating
from other solar systems and galaxies. Some Star Seeds intentionally
leave their homeland planets to inhabit earth and adapt their DNA
through reproduction with humans. Other Star Seed souls and soul
families enter the earthly evolutionary Wheel of Karma, and spiritually
incarnate in human form. Occult historians claim that earth is now
riddled with Star Seeds through genetics and spiritual connection.
from Light of Awakening