The time when something happens.
Need; requirement, necessity.
Something which causes something else; a cause.
A reason or excuse; a motive; a persuasion.
A special event or function.
A particular happening; an instance or time when something occurred.
An occurrence or state of affairs which causes some event or reaction; a motive or reason.
A favorable opportunity; a convenient or timely chance.
To cause; to produce; to induce
A time by which something must be finished.
A duration beyond which something may not exceed.