noun
Definition 1
Solemn appeal to God or revered or dreaded person or object in witness that statement is true or promise shall be kept.
Source: Concise Oxford Dictionary
Context: Mr Greenberg [former chief executive of AIG] faced an assault on his character, as Mr Wells said that [...] he had disrespected the witness stand by dodging questions and lying under oath.
Source: Financial Times 07/07/2009