any specific behavior | the act of supplying fresh air and getting rid of foul air |
the trait of being active; moving or acting rapidly and energetically | the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation |
an organic process that takes place in the body | a mechanical system in a building that provides fresh air |
a process existing in or produced by nature (rather than by the intent of human beings) | free and open discussion of (or debate on) some question of public interest |
the state of being active | |
(chemistry) the capacity of a substance to take part in a chemical reaction | |