age, era, period (of time) / the times, spirit of the age / antiquity / a time in one's life, one's days (in college etc.)

顕生代: the Phanerozoic eon

the Phanerozoic eon

most, -est

new, novel / latest, recent / modern / fresh

(archaic) new, novel / (archaic) latest, recent / (archaic) modern / (archaic) fresh

(obsolete) Alternative spelling of 新たし (aratashi): new, novel

(obsolete) Same as あたらし (atarashi) above

restraint, a check

restrain, constrain