a risk involving danger | a recognized sequence of moves at the beginning of a game of chess |
a measure of how likely it is that some event will occur; a number expressing the ratio of favorable cases to the whole number of cases possible | the act of opening something |
an unknown and unpredictable phenomenon that causes an event to result one way rather than another | becoming open or being made open |
a possibility due to a favorable combination of circumstances | the first of a series of actions |
the possibility of future success | a vacant or unobstructed space that is man-made |
| an entrance equipped with a hatch; especially a passageway between decks of a ship |
| an aperture or hole that opens into a bodily cavity |
| a possible alternative |
| the initial part of the introduction |
| the first performance (as of a theatrical production) |
| a ceremony accompanying the start of some enterprise |
| an open or empty space in or between things |
| opportunity especially for employment or promotion |