v O.Ir. forms: ipv. 3 s. forcanad, Wb. 12d41 . 2 pl. forcanid, 22d1 . pres. 1 s. rel. forchanim, 8c3 . forchun, 10a13 . 3 s. forcain, Ml. 128d9 . -forcain, Wb. 11c19 . 3 pl. forcanat Ml. 28a15 . subj. pres. 1 s. -farcan (second `a' doubtful) Ml. 68c15 . 2 sg. forcane, Wb. 28c11 , 21 . -forcane, d13 . 2 pl. forcanit, 12c18 (a prima manu, see ZCP iii 49 ). 3 pl. co forcanat , Ml. 45b18 . past subj. s. 1 forcanainn, 94b13 . fut. 1 s. fortabcech, Études Celt. xl 66 ( Ml. 53c14 ). 3 s. fordubcechna, Wb. 9a16 . pret. - perf. 1 s. forroichan sa, Ml. 17d1 . 2 sg. for tan roichan ni, 22c3 . 3 s. forrochain [sic] 68b8 . 3 pl. for tan roichechnatar ni [sic] 63b1 . Pass. pres. s. forcanar, 50d12 . for ndob canar , Wb. 3b23 . pl. forcantar, Ml. 34b12 , Tur. 49 . Past subj. 3 s. for-canta[e], Blathm. 96 § 22 . part. foircthe q.v. Vn. forcetal, q.v. Later treated as simple vb., stem forcan-, forchan- (e.g. LU 241 , LL 126a , PH 6844 , cited below). Sometimes with pref. doubled pret. - perf. forforcan, BB 423a23 . forforcansatar (foror-cansat v.l.), Ir. Lit. 34.19 .

Teaches, instructs . Gl. instituere ( Ml. 17d1 . 45b18 . 50d12 . 68b8 . 129c9 ), monere ( 94b13 ). commonere, educare, erudire, perdocere. With acc. of thing and DO of pers.: ni forcital oísa foirbthi forchanim duib, Wb. 8c3 . sai .i. fer forcain cethramadh raind suithe, Laws iv 356.8 . comalnad neich forchain in stoir sin what this story teaches ZCP viii 176.23 . íres na Trinóti ... is í sin ḟorchanubsa duitsiu, Trip. 392.15 = Lib. Hymn. i 4 . cech maith forchanus in scriptúir, PH 6844 . ro forcanus recht I taught the law 1508 . With acc. of pers.: fortanroichanni, Ml. 22c3 . forcanad cách alaile, Wb. 22c8 . amal forcantar cathchomnidi ho sacardd, Tur. 49 . cia sui forcanar nad forcanar duinib ?, IT iii 28.30 = cia saoi for-chanar ┐ na forcanar o dhaoinibh, Ériu xiii 26.1 . Cf. ciasu forcain no forcanair o duinib, IT iii 23.26 . ercid ┐ forcnaid in uli chinedach!, PH 3703 . co forcanad he im ord airnaigthi, ACL iii 10.10 . in fer ro horcthe [ = ro ḟorcthe] trisna huile disciplu, Anecd. iii 64 ( ZCP ii 321 ). is iat roforcan Albín whom A. instructed ib. In wider sense admonishes, enjoins, tells: fordubcechna (gl. uos commonefaciat) Wb. 9a16 . cu raforchanad M. i ḟís co ndigsed ... (= admonitus per soporem) Lat. Lives 90 ( RC ii 390 ). no forcanad ... German inni Gorthigernd co ro leced a mnai LU 241 = Todd Todd Nenn. 102 . tinolaiter ... a damrada chuce ... amal ra ḟorcan epscop A., LL 303a38 ( RC xiii 80 ).

With FOR of pers.: is iat forcanus for doinib ailbemniugud do Dia, PH 2354 . conid hi cinaid a marbtha side ro forcan E. aithrige forsin popul , LB 107b64 ( PH 6417 ). cid for in sliab ... na-forchanaid sib techt asa inad though ye should tell the mountain to depart ZCP xii 369.13 .

Prophesies, predicts: ní ḟurcanaim-se a ícc andso, TBC-LL¹ 4338 , cf. teora badba ... ┐ iseadh forcanaid, 5635 (St). cid forcanas ind athach what does the wind portend ? LL 126a40 ( ZCP xii 272 = forchanas, xx 193 < YBL 139a ).