I.
a.
1.
First, original, primitive, primal, primeval, primordial, pristine, aboriginal.
2.
Highest, chief, principal.
3.
Early, blooming.
4.
First-rate, capital, excellent.
II.
n.
1.
Beginning, opening, first part, earliest stage, dawn, morning.
2.
Youth, spring of life, early days.
3.
Perfection, flower, greatest beauty, health, or strength, best days, cream.