adjective
1. pertaining to rudiments or first principles; elementary
2. of the nature of a rudiment; undeveloped or vestigial.
3. primitive

Synonyms
fundamental, initial, elementary, embryonic
Antonyms
advanced, mature

noun
1. a document describing the major features of a proposed literary work, project, business venture, etc., in enough detail so that prospective investors, participants, or buyers may evaluate it:
Don’t buy the new stock offering until you read the prospectus carefully.
2. a brochure or other document describing the major features, attractions, or services of a place, institution, or business to prospective patrons, clients, owners, or members.

adjective
1. unusually advanced or mature in development, especially mental development.
a precocious child.
2. prematurely developed, as the mind, faculties, etc.
3. of or relating to premature development.
4. Botany. flowering, fruiting, or ripening early, as plants or fruit.
bearing blossoms before leaves, as plants. appearing before leaves, as flowers.

adjective
unusually advanced or mature in development, especially mental development