Earliest in time or serial order, first; also, the first of two, former.

Earliest, first produced; first, most ancient. archaic. Also quasi-n.

With regard to time: preceding all others in occurrence, existence, etc.; happening, existing, or… With a noun or simple noun phrase.

Belonging to the beginning or earliest stage of something; existing at or from the first; earliest, first in time.

In regard to time: Prior to all others in occurrence, existence, etc.; = first, adj. 4a. Obsolete.

Foremost, first. Obsolete.

Occurring or existing first in a sequence of events; belonging to the beginning or earliest stage of something; first in time.

First, earliest; most important. Obsolete.

First in order of existence or development; primary, original, fundamental; from which another thing may derive or proceed.

Chief, principal, prime, pre-eminent. (Now rarely used without the hyphen.)

In superlative. Earliest. Also absol.

= original, adj. 2a. Obsolete. rare.

Ultimate, original. Obsolete. rare.

First in time; earliest.

Original; first or earliest as recorded by history. Cf. aboriginal, adj. 1a. Obsolete. rare.

In past time: Earliest, first. Obsolete.

That is the source or origin of other things; original, primary.

Chiefly Theology and Philosophy. Constituting a source or origin; primary, original; basic, fundamental.

First in time; earliest, opening, initial. Cf. premier, adj. 2.

Relating to an early, basic, or undeveloped form of logic; (Philosophy) designating a method of expressing simple logical relationships which has…

(attributive) that is the first experienced, known, recorded, etc., at any time (cf. ever, adv. 5b).