commentātĭo (noun F) : id..
* Abstr., a diligent meditation upon something, a studying, a careful preparation, μελέτη (so perh. only in Cic.): loci multa commentatione atque meditatione parati,Cic. de Or. 2, 27, 118.—In plur., Cic. de Or. 1, 60, 257; id. Brut. 71, 249; 27, 105: commentatio inclusa in veritatis lucem proferenda est,id. de Or. 1, 34, 157.—*
* As rhet. fig., = ἐνθύμημα, Quint. 5, 10, 1.
* Concr., a learned work, treatise, dissertation, description (so perh. not ante-Aug.): commentatio (de naturā animalium),Plin. 8, 16, 17, § 44; so, Indiae,id. 6, 17, 21, § 60. —In plur., Plin. 28, 1, 2, § 7; Gell. praef. § 4.

s. TLL