[1] Likewise or similarly in other lexica; references at Photius tau502 Theodoridis. The headword, accusative singular of this noun, must be quoted from somewhere but is far too common to track down.
[2] Largely taken from Diogenes Laertius 7.77, which gives some definitions of the Stoic philosopher Crinis (2nd century BCE) concerning what an argument is, types of arguments, etc. This 'scheme or form of argument' is the form of the propositional argument corresponding to the so-called modus ponendo ponens: 'If p, then q; but p. Therefore, q', where the letters 'p' and 'q' are propositional variables. This is also the first (of the five) 'indemonstrable arguments' (a)napo/dektoi lo/goi) recognized by the Stoics, that is, the one in which a complete argument is constructed out of a conditional ('if p, then q') and the antecedent of the conditional ('p') with its consequent ('q') as a conclusion (see Diogenes Laertius 7.79-80, where this is attributed to the Stoic Chrysippus). The first part of this material also appears (with some variations) at lambda 659.
[3] George of Pisidia, Persian Expedition 3.17.