witnessableadj.
/ˈwɪtnɪsəb(ə)l/ rare.
That may be witnessed.
ΘΚΠ
the mind > attention and judgement > testing > attestation, witness, evidence > [adjective] > capable of being adduced
allegeable1542
apportable1604
citable1616
produceablea1641
vouchablea1641
submittable1648
producible1667
adduceable1671
submissiblea1733
adducible1766
attestable1771
witnessable1870
1870 Eng. Mech. 25 Feb. 580/1 If this be not a witnessable fact, it is at any rate a self-evident one.
1891 Athenæum 30 May 710/2 In one..a great improvement is witnessable.
This entry has not yet been fully updated (first published 1928; most recently modified version published online March 2018).
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adj.1870