of the nature of or made or done as a trial, experiment, or attempt; experimental: a tentative report on her findings.
unsure; uncertain; not definite or positive; hesitant: a tentative smile on his face.

1580–90; < Medieval Latin tentātīvus, equivalent to Latin tentāt(us) (past participle of tentāre, variant of temptāre to test; see tempt) + -īvus -ive

tentatively, adverb
tentativeness, noun
nontentative, adjective
nontentatively, adverb
nontentativeness, noun
pretentative, adjective
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
tentative (ˈtɛntətɪv)
1.  provisional or experimental; conjectural
2.  hesitant, uncertain, or cautious
[C16: from Medieval Latin tentātīvus, from Latin tentāre to test]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

1580s, from M.L. tentativus "trying, testing," from L. tentatus, pp. of tentare "to feel, try," (variant of temptare "to feel, try, test"). Related: Tentatively.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Some genes have even been linked, tentatively, to these conduct disorders.
Two more chimpanzee teeth were later found at the site, an upper incisor and a
  tooth tentatively identified as a molar.
For all these questions the rumor mill provided answers, but tentatively.
In fact, new plants are on the way, however tentatively.
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