From The Collaborative International Dictionary of English v.0.48 :
Significative \Sig*nif"i*ca*tive\, a. [L. significativus: cf. F.
significatif.]
1. Betokening or representing by an external sign.
[1913 Webster]
The holy symbols or signs are not barely
significative. --Brerewood.
[1913 Webster]
2. Having signification or meaning; expressive of a meaning
or purpose; significant.
[1913 Webster]
Neither in the degrees of kindred they were
destitute of significative words. --Camden.
[1913 Webster] -- Sig*nif"i*ca*tive*ly, adv. --
Sig*nif"i*ca*tive*ness, n.
[1913 Webster]
From WordNet (r) 3.0 (2006) :
significative
adj 1: (usually followed by `of') pointing out or revealing
clearly; "actions indicative of fear" [syn: indicative,
indicatory, revelatory, significative,
suggestive]