Correct spelling for the English word "know for certain" is [nˈə͡ʊ fɔː sˈɜːtən], [nˈəʊ fɔː sˈɜːtən], [n_ˈəʊ f_ɔː s_ˈɜː_t_ə_n] (IPA phonetic alphabet).
The phrase "know for certain" refers to having absolute knowledge or complete certainty about something. It signifies a high level of confidence in a particular understanding or belief. When a person claims to "know for certain," they assert that they possess factual and conclusive information that leaves no room for doubt or ambiguity.
To "know for certain" implies that the individual has acquired irrefutable evidence, reliable sources, or personal experience that supports their claim. It suggests that they have thoroughly examined the available information and have no reason to doubt its accuracy. In this context, "knowing for certain" often indicates a level of certainty that surpasses mere belief or speculation.
"Knowing for certain" often goes hand in hand with a subjective feeling of assurance or conviction. It suggests a mental state in which doubt and skepticism have been eliminated, replaced by unwavering confidence and certainty.
However, it is important to note that the phrase "know for certain" does not imply infallibility. It conveys a strong degree of confidence, but, ultimately, human knowledge is always subject to revision or modification based on new discoveries or information. Therefore, even when someone claims to "know for certain," it is vital to maintain an open mind and to be receptive to alternative perspectives and evidence that may challenge or change that certainty.