inter-sum, fui, esse (interfutūrus, Cic. Div. in Caecil. 11, 35; in tmesi: interque esse desiderat pugnis, Arn. 7, 255), v. n., to be between, lie between (class.; syn. interjaceo). In gen. Of space: quas (segetes) inter et castra unus omnino collis intererat, Caes. B. G. 6, 35: ut Tiberis inter eos et pons interesset, Cic. Cat. 3, 2: via interest perangusta, Liv. 22, 4: morari victoriam rati, quod interesset amnis, id. 21, 5: quod interest spatii, Plin. 6, 9, 10, § 28.
— Of time: cujus inter primum et sextum consulatum sex et quadraginta anni interfuerunt, elapsed, Cic. de Sen. 17, 60: inter Laviniam et Albam Longam coloniam deductam triginta ferme interfuere anni, Liv. 1, 3; Cic. Leg. 3, 3, 8.
— Transf. To be apart; with abl. of distance (syn. disto): clathros interesse oportet pede, Cato, R. R. 4.
— To be different, to differ: ut inter eos, ne minimum quidem intersit, there is not the slightest difference, Cic. Ac. 2, 17, 52: inter hominem et beluam hoc maxime interest, quod, men differ chiefly from brutes in this, that, etc., id. Off. 1, 4, 11: vide, quantum interfuturum sit inter meam atque tuam accusationem, how great a difference there will be, id. Div. in Caecil. 11, 35: in his rebus nihil omnino interest, there is no difference whatever, id. Ac. 2; 15, 47: hoc pater ac dominus interest, there is this difference, Ter. Ad. 1, 1, 51: tantum id interest, veneritne eo itinere ad urbem, an ab urbe in Campaniam redierit, Liv. 26, 11.
— With ab (like differo, rare): negant quidquam a falsis interesse, Cic. Ac. 2, 9, 27; cf.: quod intersit aut differat, aliud ab alio, id. Fin. 3, 7, 25: quod ab eo nihil intersit, etc., id. Ac. 2, 26, 83.
—With dat.: ut matrona Intererit Satyris paulum pudibunda protervis, Hor. A. P. 232: quid dimidium dimidiato intersit, Gell. 3, 14, 4.
—With gen. (in analogy with the Gr. διαφέρειν τινός): quoniam τὸ νεμεσᾶν interest (= διαφέρει) τοῦ φθονεῖν, i. e. anger differs from envy, Cic. Att. 5, 19 fin.
— To be present at, take part in, attend; constr. absol., with dat. or in and abl. Absol.: ac si ipse interfuerit, ac praesens viderit, Cic. Inv. 1, 54, 104: interfuisse me memini, Suet. Dom. 12.
— With dat. rei: consiliis, Cic. Att. 14, 22, 2; 2, 23, 3: crudelitati, id. ib. 9, 6, 7: negotiis, id. Fam. 1, 6: lacrimis patris, Verg. A. 11, 62: ludis, Suet. Tib. 72: caedi, id. Dom. 47: rebus gerendis, Gell. 5, 18, 1: sermoni, id. 11, 7, 1: senatui, Cic. Dom. 11; Suet. Claud. 46: populo Quirini, to be among, live with, Hor. C. 1, 2, 46: rebus divinis, Caes. B. G. 6, 13, 4: proelio, id. ib. 7, 87: bello, Liv. 36, 4: spectaculo, id. 2, 38.
— Also, with dat. loci: curiae, Suet. Aug. 38: contubernio patris, Aur. Vict. Caes. 27, 1.
—Also, with dat. pers.: sacrificanti interfuit, attended him, Suet. Oth. 6.
— With in and abl.: in convivio, Cic. Rosc. Am. 14, 39: in testamento faciendo, id. Clu. 59, 162: voluerunt eos in suis rebus ipsos interesse, Cic. Verr. 2, 3, 6, § 14: quibus in rebus, Auct. Her. 1, 9.
— Also used of time, to live in: quisquis illis temporibus interfuit, Vell. 2, 114, 2: cui tempori Saturninus interfuit, Sulp. Sev. Dial. 3, 3; cf.: ea (ratiocinatio) dicitur interfuisse tum, cum aliquid vitasse aut secutus esse animus videbitur, to have taken place, Cic. Inv. 2, 5, 18.
— To interest, be of interest to one (very rare as pers. verb): non quo mea interesset natura loci, Cic. Att. 3, 19, 1 (cf. interest, impers. infra).
— Esp.:
interest, impers., it makes a difference, interests, concerns, imports; is of interest, importance; constr. with gen. pers. or meā, tuā, suā, and with a subj. or rel. clause, ut or ne, or with ad: ea vos rata habeatis, ne magis reipublicae interest, quam mea, Liv. 26, 31, 10: quanto opere reipublicae communisque salutis intersit, manus hostium distineri, Caes. B. G. 2, 5, 2: semper ille, quantum interesset P. Clodii, se perire, cogitabat, Cic. Mil. 21, 56: quid illius interest, ubi sis? id. Att. 10, 4, 10: quis enim est hodie, cujus intersit istam legem manere? id. Phil. 1, 9: hoc vehementer interest rei publicae, id. Q. Fr. 2, 4, 1: quod ego et mea et rei publicae interesse arbitror, id. Fam. 2, 19 fin.: multum interest rei familiaris tuae, te quam primum venire, id. Fam. 4, 10, 2: tuā et meā maxime interest, te valere, id. ib. 16, 4: id ignorare eos velis, quorum intersit id scire, id. Off. 3, 13, 57.— With ut or ne: illud meā magni interest, te ut videam, Cic. Att. 11, 22, 2: quod ut facias tuā interesse arbitror, id. Fam. 12, 18, 2: vestrā interest, ne imperatorem pessimi faciant, Tac. H. 1, 30: non tam suā quam reipublicae interesse ut salvus esset, Suet. Caes. 86; so, utriusque nostrum magni interest ut te videam, Cic. Fam. 3, 5, 4 B. and K. (dub.).
— With gen. pretii: quod meus familiaris tanti suā interesse arbitraretur, Cic. Fam. 13, 10.
—With rel. or interrog.-clause: in omnibus novis conjunctionibus interest, qualis primus aditus sit, Cic. Fam. 13, 10, 4: non tam interest, quo animo scribatur, quam quo accipiatur, Caecin. ap. Cic. Fam. 6, 7, 1: neque multum interest, quod nondum per numeros distributi sunt, Plin. Ep. 10, 30, 2; cf. with utrum ... an: quid interfuit, homo audacissime, utrum hoc decerneres, an, etc., what mattered it? Cic. Verr. 2, 3, 61, § 141: nihil interest nunc, an violaverim, etc., Liv. 26, 31.
— With ad: ad honorem interesse, Cic. Fam. 16, 1, 1: ad decus et ad laudem civitatis, id. N. D. 1, 4, 7: ad laudem nostram, id. ib. 5, 12, 2: ad beate vivendum, id. Fin. 2, 28, 90.