PRACTISING

Verb

practising

present participle of practise

Noun

practising (plural practisings)

The act of one who practises.

Source: Wiktionary

PRACTISE

Prac"tise, v. t. & i.

Definition: See Practice.

Note: The analogy of the English language requires that the noun and verb which are pronounced alike should agree in spelling. Thus we have notice (n. & v.), noticed, noticing, noticer; poultice (n. & v.); apprentice (n. & v.); office (n. & v.), officer (n.); lattice (n.), latticed (a.); benefice (n.), beneficed (a.), etc. Cf. sacrifice (surmise (promise (compromise (advice (advise (device (devise (

Source: Webster’s Unabridged Dictionary 1913 Edition