adverb. Long ago; long since.

noun. Time long past; times past.

noun. Time long past; the days of long ago. See syne.

adverb. Long since; long ago.

adverb. Yesteryear, in the old days, some time ago.

adverb. at a distant time in the past (chiefly Scottish)

noun. past times remembered with nostalgia

adverb. of the distant or comparatively distant past

"“It was not Christie,” said Mary; “it was — it was a gentleman — a gentleman with a bright breastplate, like what I hae seen langsyne, when we dwelt at Avenel —”"

past  past times  yesteryear