Meanings

lesser cuckoo (Cuculus poliocephalus)

blue passion flower (Passiflora caerulea)

time fuse (often used to detonate high explosives)

timepiece

prehistoric era

protohistory (the period between prehistory and history)

at the time of writing

victory depends on the turn of fortune

Copper Age

Amarna period (of Egyptian history)

Ōgosho period (between the Kansei Reforms and the Tempo Reforms, approx. 1787-1843)

Kōnin-Jōgan period (of Japanese art history; approx. 794-894 CE)

Shokuhō period (i.e. the Azuchi-Momoyama period, approx. 1568-1600)

Precambrian era

Tenpyō period (esp. used as a period of art history, 710-794 CE)

Bunka-Bunsei period (approx. 1804-1830)

Gempei period (late 11th century-late 12th century CE)

Jōgan period (of art history; 859-877 CE)

Tanuma period (1767-1786)

sometime