Conceivable means possible to believe or imagine. Every conceivable option, hardly conceivable, it is conceivable that.
It sets a very low bar: saying something is conceivable claims only that it cannot be ruled out, which is why it is used to concede a point without granting it. Every conceivable is the fixed intensifier — every conceivable colour. Note conceivably, which hedges a claim; inconceivable; and that conceive means both to imagine and to become pregnant, from the same Latin for taking in.
1adjectiveconceivablePossible to believe or imagine.
“It's conceivable that the letter was lost in the post, but I doubt it.”
conceivable is a quality of possibility.
Conceive plus -able, from Latin concipere, to take in — con plus capere, to take. Capture, receive and deceive come from the same taking.
Proto-Indo-European
*kap-
Middle English
conceyvable
English, today
conceivable
From Middle English conceyvable, equivalent to conceive + -able.
Etymology from Wiktionary, CC BY-SA