to this extent · insofar as · only, simply, merely
köken: From dum (“as, while, during”) + taxat (3rd person singular present active indicative of taxō). Literally, "as one examines", "as one may judge".
nec animum dumtaxat vōbīs fidēlem ac bonum praestitit, sed omnibus interfuit bellīs, quae in Graeciā gessistis