a measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return; "sonar is an acronym for sound navigation ranging"; "asdic is an acronym for antisubmarine detection investigation committee"
direct and obvious in meaning or reference; often unpleasant; "a pointed critique"; "a pointed allusion to what was going on"; "another pointed look in their direction"
having a bearing on or connection with the subject at issue; "the scientist corresponds with colleagues in order to learn about matters relevant to her own research"
a piece of information about circumstances that exist or events that have occurred; "first you must collect all the facts of the case"
a concept whose truth can be proved; "scientific hypotheses are not facts"
a statement or assertion of verified information about something that is the case or has happened; "he supported his argument with an impressive array of facts"
an event known to have happened or something known to have existed; "your fears have no basis in fact"; "how much of the story is fact and how much fiction is hard to tell"
a subdivision of a written work; usually numbered and titled; "he read a chapter every night before falling asleep"
a series of related events forming an episode; "a chapter of disasters"
a local branch of some fraternity or association; "he joined the Atlanta chapter"
an ecclesiastical assembly of the monks in a monastery or even of the canons of a church
any distinct period in history or in a person's life; "the industrial revolution opened a new chapter in British history"; "the divorce was an ugly chapter in their relationship"
a part of a structure having some specific characteristic or function; "the spacious cooking area provided plenty of room for servants"
the extent of a 2-dimensional surface enclosed within a boundary; "the area of a rectangle"; "it was about 500 square feet in area"
a part of an animal that has a special function or is supplied by a given artery or nerve; "in the abdominal region"
a subject of study; "it was his area of specialization"; "areas of interest include..."
a particular geographical region of indefinite boundary (usually serving some special purpose or distinguished by its people or culture or geography); "it was a mountainous area"; "Bible country"