Part of Speech:
from the same as ἀεί; properly, an age; by extension, perpetuity (also past); by implication, the world; specially (Jewish) a Messianic period (present or future):--age, course, eternal, (for) ever(-more), (n-)ever, (beginning of the , while the) world (began, without end). Compare χρόνος.
A lifetime or time period with a beginning and end, an era, an age, the completion of which is beyond human perception, but known only to God the creator of the aiōns, Hebrews 1:2. Never meaning simple endless or infinite chronological time
in Koine Greek usage. Read Dr. Heleen Keizer and Ramelli and Konstan