年代学

年代学	nián dài xué	chronology (the science of determining the dates of past events)
年	Nián	surname Nian
年	nián	year / CL:个
年	nián	grain / harvest (old) / variant of 年
年代	nián dài	a decade of a century (e.g. the Sixties) / age / era / period / CL:个
代	dài	to be a substitute for; to act on behalf of; to replace; to substitute / generation; dynasty; age; period; (historical) era; (geological) eon
学	xué	to learn / to study / to imitate / science / -ology