The Collaborative International Dictionary of English v.0.48:

Lateness \Late"ness\, n.
   The state, condition, or quality, of being late; as, the
   lateness of his arrival; the lateness of the hour; the
   lateness of the season.
   [1913 Webster]

WordNet (r) 3.0 (2006):

lateness
    n 1: quality of coming late or later in time [ant: earliness]

Moby Thesaurus II by Grady Ward, 1.0:

80 Moby Thesaurus words for "lateness":
   afterlife, anachronism, antedating, anticipation, brand-newness,
   callowness, dewiness, earliness, following, freshness, future time,
   gloss of novelty, greenness, hangover, historical error,
   immaturity, impropriety, inappropriateness, inauspiciousness,
   inconvenience, inexpedience, infelicity, inopportuneness,
   inopportunity, intactness, intempestivity, interruption, intrusion,
   irrelevance, maidenhood, metachronism, mint condition, misdate,
   misdating, mistiming, newbornness, newfangledness, newfangleness,
   newness, next life, novelness, novelty, nowness, originality,
   parachronism, postdate, postdating, posteriority, prematurity,
   presentness, pristineness, prochronism, prolepsis, provenience,
   rawness, recency, recentness, remainder, sequence, strangeness,
   subsequence, succession, supervenience, supervention, tardiness,
   uncommonness, unfamiliarity, unfavorableness, unfitness,
   unfittingness, unfortunateness, unpropitiousness, unpunctuality,
   unripeness, unseasonableness, unsuitability, untimeliness,
   unusualness, virginity, wrongness