[im.me.mo.ri.al] adj [prob. fr. F immemorial, fr. MF, fr. ML immemorialis lacking memory, fr. L in- + memorialis memorial] (1602): extending or existing since beyond the reach of memory, record, or tradition "existing from time ~" -- im.me.mo.ri.al.ly adv
IMMEMORIAL
Meaning of IMMEMORIAL in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012