to make active; cause to function or act.
- to render more reactive; excite:
to activate a molecule.
- to induce radioactivity.
to aerate (sewage) in order to accelerate decomposition of impure organic
matter by microorganisms.
- to make (carbon, a catalyst, molecules, etc.) more active.
- to hasten (reactions) by various means, as heating.
to place (a military unit or station) on an active status in an assigned capacity.
the unlimited or incalculably great three-dimensional realm or expanse in which all material objects are located and all events occur.
the portion or extent of this in a given instance; extent or room in three dimensions:
the space occupied by a body.
extent or area in two dimensions; a particular extent of surface:
to fill out blank spaces in a document.
- the designed and structured surface of a picture:
In Mondrian's later work he organized space in highly complex rhythms.
- the illusion of depth on a two-dimensional surface.
a seat, berth, or room on a train, airplane, etc.
a place available for a particular purpose:
a parking space.
linear distance; a particular distance:
trees separated by equal spaces.
Mathematics. a system of objects with relations between the objects defined.
extent, or a particular extent, of time:
a space of two hours.
an interval of time; a while:
After a space he continued his story.
an area or interval allowed for or taken by advertising, as in a periodical, on the radio, etc.
Music. the interval between two adjacent lines of the staff.
an interval or blank area in text:
a space between the letters.
Printing. one of the blank pieces of metal, less than type-high, used to separate words, sentences, etc.
Telegraphy. an interval during the transmitting of a message when the key is not in contact.
radio or television broadcast time allowed or available for a program, advertisement, etc.
freedom or opportunity to express oneself, resolve a personal difficulty, be alone, etc.; allowance, understanding, or noninterference: