cir·cum·stance 
(sûrkəm-stăns′)
(sûrkəm-stăns′)n.
1. A condition or fact attending an event and having some bearing on it; a determining or modifying factor: set out a day early because of favorable circumstances.
2. The sum of determining factors beyond willful control: a victim of circumstance.
3. circumstances Financial status or means: "Prior came of a good family, much reduced in circumstances" (George Sherburn).
4. Formal display; ceremony: the pomp and circumstance of a coronation.
5. A particular incident or occurrence: Your arrival was a fortunate circumstance.
tr.v. cir·cum·stanced, cir·cum·stanc·ing, cir·cum·stanc·es
Idioms: To place in particular circumstances or conditions; situate.
under no circumstances
In no case; never.
under/in the circumstances
Given these conditions; such being the case.
[Middle English, from Old French circonstance, from Latin circumstantia, from circumstāns, circumstant-, present participle of circumstāre, to stand around : circum-, circum- + stāre, to stand; see stā- in the Appendix of Indo-European roots.]