adv. 25B6; adverb
this is certainly a late work : UNQUESTIONABLY, surely, assuredly, definitely, beyond/without question, without doubt, indubitably, undeniably, irrefutably, indisputably; obviously, patently, evidently, plainly, clearly, unmistakably, undisputedly, undoubtedly, as sure as eggs is eggs.
our revenues are certainly lower : ADMITTEDLY, without question, definitely, undoubtedly, without a doubt.
possibly.
25B6; exclamation Shall we eat now? Certainly. : YES, definitely, absolutely, sure, by all means, indeed, of course, naturally; affirmative; Brit. dated rather.