Categorise /ˈkæt.ə. g ə r aɪz/ verb [ t ] to put people or things into groups with the same features The books are categorized into

rational /ˈræʃ. ə n. ə l/ adjective

showing clear thought or reason

He was too upset to be rational.

a rational course of action/argument/explanation

454.	halt	/hɒlt/ verb [ I or T ] to (cause to) stop moving or doing something or happening "Halt!" called the guard. "You can't go any further without a permit." Production has halted at all of the company's factories because of the pay dispute. Security forces halted the demonstrators by blocking the road. noun [ S ] 1. when something stops moving or happening the recent halt in production Severe flooding has brought trains to a halt (= prevented them from moving) on several lines in Scotland. The bus came to a halt (= stopped) just in time to avoid hitting the wall. If traffic increases beyond a certain level, the city grinds to a halt (= stops completely) . The car screeched to a halt (= suddenly and noisily stopped) just as the lights turned red. 2. call a halt to sth to prevent something from continuing How many more people will have to die before they call a halt to the fighting?
455.	contemplate	/ˈkɒn.təm.pleɪt/ verb [ I or T ] to spend time considering a possible future action, or to consider one particular thing for a long time in a serious and quiet way [ + -ing verb ] I'm contemplating go ing abroad for a year. You're not contemplating a change of job, are you? It's too awful/horrific/dangerous to contemplate.
456.	brief	/briːf/ adjective SHORT IN TIME 1. lasting only a short time or containing few words His acceptance speech was mercifully brief. I had a brief look at her report before the meeting. adjective SHORT IN LENGTH 2. (of clothes) very short She was wearing a rather brief skirt, as I recall. adjective SHORT IN LENGTH 3. (of clothes) very short She was wearing a rather brief skirt, as I recall. noun SHORT FORM 4. in brief If something is said in brief, it is said in a very short form, with very few details "So you didn't enjoy the party then." "In brief, no." noun INSTRUCTIONS 5. [ C ] UK a set of instructions or information [ + to infinitive ] It was my brief to make sure that the facts were set down accurately.
457.	advance	/ədˈvɑːn t  s/ verb GO FORWARD 1. [ I or T ] to go or move something forward, or to develop or improve something The fire advanced steadily through the forest. 2. to pay someone some money before the regular time [ + two objects ] Could you advance me £50 until Tuesday? verb SUGGEST 3. [ T ] formal to suggest an idea or theory the theory advanced in this article adjective [ before noun ] happening, done or ready before an event advance payment/booking We got no advance warning/notice of the changes.