first light(n = noun.time) aurora, break of day, break of the day, cockcrow, dawn, dawning, daybreak, dayspring, morning, sunrise, sunup - the first light of day; "we got up before dawn"; "they talked until morning"
is a kind of hour, time of day

anchor light, arc light, at first, at first blush, at first glance, at first sight, auld light, beacon light, beam of light, bengal light, brake light, bring to light, bude light, calcium light, city of light, coherent light, come to light, corpuscular theory of light, double first, electric light, electrical light, fairy light, finsen light, first, first aid, first amendment, first and foremost, first and last, first appearance, first balcony, first baron beveridge, first baron kelvin, first baron lytton, first baron macaulay, first baron marks of broughton, first baron passfield, first baron rutherford, first baron rutherford of nelson, first baron tennyson, first base, first baseman, first battle of ypres, first blush, first cause, first class, first council of constantinople, first council of lyons, first council of nicaea, first cousin, first cranial nerve, first crusade, first degree, first derivative, first draft, first duke of marlborough, first duke of wellington, first earl kitchener of khartoum, first earl of beaconsfield, first earl of chatham, first earl of orford, first earl wavell, first epistle of john, first epistle of paul the apostle to the corinthia, first epistle of paul the apostle to the thessalon, first epistle of paul the apostle to timothy, first epistle of peter, first epistle to the corinthians, first epistle to the thessalonians, first epistle to timothy, first estate, first floor, first gear, first grade, first half, first harmonic, first impression, first in first out, first lady, first language, first lateran council, first law of motion, first law of thermodynamics, first lieutenant, first lord of the treasury, first marquess cornwallis, first mate, first moment, first mortgage, first move, first name, first of all, first of may, first of october antifascist resistance group, first off, first offender, first period, first person, first place, first principle, first prize, first quarter, first rate, first reading, first rudiment, first sacker, first sergeant, first state, first step, first stomach, first strike, first string, first team, first thing, first trimester, first vatican council, first viscount haldane of cloan, first viscount nuffield, first water, first world war, for the first time, green light, guiding light, idiot light, in the first place, infrared light, inner light, kepler's first law, klieg light, laser light, last in first out, leading light, light, light adaptation, light air, light arm, light ballast, light beam, light beer, light bread, light breeze, light brown, light bulb, light circuit, light colonel, light company, light cream, light diet, light filter, light flyweight, light footed, light heavyweight, light hour, light intensity, light into, light machine gun, light meter, light microscope, light middleweight, light minute, light opera, light out, light pen, light reaction, light reflex, light second, light show, light source, light speed, light time, light touch, light unit, light up, light upon, light welterweight, light whipping cream, light within, light year, lime light, make light of, navigation light, newton's first law, newton's first law of motion, one-way light time, oxyhydrogen light, panel light, pilot light, ray of light, rear light, red light, red light district, riding light, right of first publication, room light, round-trip light time, running light, saint elmo's light, saint ulmo's light, see the light, sergeant first class, shaft of light, shed light on, signal light, speed of light, stop light, strobe light, sweetness and light, theater light, traffic light, trip the light fantastic, trip the light fantastic toe, ultraviolet light, very light, vigil light, visible light, warning light, wave theory of light, wax light, when first seen, yellow light, zircon light, zodiacal light