Presumably/prɪˈzuːməbli/ Definition 1 of 1Pro Tip 1/3Context Clues Use surrounding words to determine if 'presumably' fits, as it implies uncertainty. She's not answering her phone, presumably she's still asleep. Pro Tip 2/3Not a Guarantee 'Presumably' does not mean something is certain, just that it's a reasonable guess. Presumably, the meeting will end before lunch. Pro Tip 3/3Suggests Bias Using 'presumably' could reveal your expectations or bias about the situation. He's late again, presumably because he doesn't care.