tantummodo
From LSJ
αὐτὸν κέκρουκας τὸν βατῆρα τοῦ λόγου → you have struck the very threshold of the argument, you have struck the most important and chiefmost point
Latin > English (Lewis & Short)
tantummŏdo: v. tantus, II. B. b.
Latin > French (Gaffiot 2016)
tantummŏdŏ,¹⁰ seulement : Cic. Rep. 2, 51 ; Nat. 2, 81, etc. ; non... tantummodo, sed... Cic. de Or. 3, 52, non pas seulement, mais..., cf. Liv. 9, 37, 2 ; 21, 32, 4.