Lewis Short
(adverb) : īlĭco (less correctly illĭco, Ritschl ad Plaut. Trin. 3, 1, 7), in-loco
* In that very place, on the spot, there.
* Lit. (anteclass.): his persuadent, ut ilico manerent: pars ilico manent, Cass. Hem. ap. Non. 325, 10: manete ilico,Caecil. ib. 12; Naev. ib. 7: ilico habitato, Att. ib.: otiose nunc jam ilico hic consiste,Ter. Ad. 2, 1, 2 Don.: sta ilico,id. Phorm. 1, 4, 18.
* Transf. *
* Ilico illo, to that place, thither, Non. 325, 5; Turp. ap. Non. l. l. (Com. Fragm. v. 105 Rib.).
* Of time, Engl. on the spot, i. e. instantly, immediately, directly (class.; syn.: extemplo, repente, protinus, statim, continuo): regrediendum est ilico, Pac. ap. Non. 325, 2: ilico ante ostium hic erimus,Caecil. ib. 3: haec ubi legati pertulere, Amphitruo e castris ilico Producit omnem exercitum,Plaut. Am. 1, 1, 61; cf. id. Stich. 4, 1, 51; id. Cas. 4, 4, 6: simul atque increpuit suspicio tumultus, artes ilico nostrae conticescunt,Cic. Mur. 10, 22 fin.: sequitur ilico,id. Fat. 12, 28: ilicone ad praetorem ire convenit?id. Quint. 15, 48.
Charlton T. Lewis, Charles Short, A Latin Dictionary