Medical conditions known to cause swelling that affects both legs equally include heart disease, kidney disease, liver disease, and chronic sleep apnea, and complications of diabetes. Premenstrual syndrome (PMS) is also a well-known cause of swelling in the ankles and feet.
Definition of serendipity for English Language Learners. : luck that takes the form of finding valuable or pleasant things that are not looked for.
Historical Examples. 1  That polite trifler is fond of a word which he coined himselfâ'serendipity.'. 2  They think of serendipity as earned, of work as bestowed, of success as deserved and reserved to the deserving. 3  It is more than this: it is a matter of observation to any one with a moderate degree of serendipity..