a pernicious and malign influence that is hard to get rid of | causing something without any direct or apparent effort |
any epidemic disease with a high death rate | a power to affect persons or events especially power based on prestige etc |
a serious (sometimes fatal) infection of rodents caused by Yersinia pestis and accidentally transmitted to humans by the bite of a flea that has bitten an infected animal | a cognitive factor that tends to have an effect on what you do |
| one having power to influence another |
| the effect of one thing (or person) on another |