intelligence activities concerned with identifying and counteracting the threat to security posed by hostile intelligence organizations or by individuals engaged in espionage or sabotage or subversion or terrorism
pick out, select, or choose from a number of alternatives; "Take any one of these cards"; "Choose a good husband for your daughter"; "She selected a pair of shoes from among the dozen the salesgirl had shown her"
select as an alternative; choose instead; prefer as an alternative; "I always choose the fish over the meat courses in this restaurant"; "She opted for the job on the East coast"
see fit or proper to act in a certain way; decide to act in a certain way; "She chose not to attend classes and now she failed the exam"