Dictionary Definition:
śās (cf. √śaṃs), cl. 2. P. (cf. Dhātup. xxiv, 67) śāsti (Ved. and ep. also śā́ste and śāsati, ○te
• du. śiṣṭhaḥ &c. Pāṇ. 6-4, 34
• 3. pl. śāsati ib. vi, 1, 6
• impf. aśāt Br. &c
• Impv. śādhi, śāstána RV.
• Pot. śiṣyāt Up. GṛŚrS.
• pf. śaśāsa, ○suḥ [in RV. also Impv. śaśādhi and Subj. śaśās] RV. &c. &c
• aor. aśiṣat [in RV. also 1. pl. śiṣāmahi and p. śiṣát] ib.
• fut. śāsitā Gr
• śāsiṣyati, ○te Br. &c
• inf. śāstum GṛŚrS.
• śāsitum MBh. &c
• ind. p. śāsitvā or śiṣṭvā ib.
• -śiṣya Br. Up.
• -śāsya MBh. &c.), to chastise, correct, censure, punish RV. &c. &c
• to restrain, control, rule, govern (also with rājyam or aiśvaryam) MBh. Kāv. &c
• to administer the laws (with dharmam, 'to admṭadminister justice') MBh.
• to direct, bid, order, command, enjoin, decree (with an inf. or a sentence followed by iti) ib.
• to teach, instruct, inform (with two acc., or with acc. of pers. and dat. or loc. of thing) RV. &c. &c
• to confess (a crime) Mn. xi, 82
• to announce, proclaim Bhaṭṭ.
• to predict, foretell VarBṛS.
• to blame, reject, disdain (?) RV. x, 32, 4
• to praise, commend (= √śaṃs) Hit. iii, 102: Pass. śāsyate or śiṣyate (cf. √śiṣ), to be chastised or corrected &c. MBh. Kāv. &c.: Caus. śāśayati (aor. aśaśāsat Pāṇ. 7-4, 2), to recommend Bālar. v, 33: Desid. śiśāsiṣati Gr.: Intens. śeśiṣyate, śāśāsti ib.