ETYMOLOGY
from Latin longitas (length, long duration), from longus (long) + -tas (-ty)
EXAMPLE
“…And had not this beene: yet if your brevity (which is but a shuffling colour, to make shewe of some things which are not) had beene turned into one yeeres or seaven yeeres longity, you could not have shewed, that in substantiall points of faith there was variace among vs. And therfore for that matter you do wel to do as you do, that is, put vp your pipes & make no more noise. …”
From: The Reasons vvhich Doctour Hill hath brought, for the Vpholding of Papistry, which is falselie termed the Catholike religion: Vnmasked and Shewed to be very weake, and vpon examination most insufficient for that purpose.
By George Abbot, 1604
Lexicophilia 