Equity stems from a legal term for an alternative court system from the Common Law court. (See the Constitution Art 3 Sec 2 clause 1 “…all cases in Law and Equity…”) Cases seeking monetary damages would be adjudicated by Equity Law, i.e. they would fix the fair and equitable value due - just like the fair and equitable value of the portion of the property owned.
Radical is good example of the connotation overtaking the etymon yet still not shaking itself free from its roots.
- [radical](http://www.etymonline.com/index.php?term=radical&allowed_in_frame=0)
- late 14c. (adj.), in a medieval philosophical sense, from L.L. radicalis "of or having roots," from L. radix (gen. radicis) "root" (see [radish](http://www.etymonline.com/index.php?term=radish&allowed_in_frame=0)). Meaning "going to the origin, essential" is from 1650s. Political sense of "reformist" (via notion of "change from the roots") is first recorded 1802 (n.), 1820 (adj.), of the extreme section of the British Liberal party (radical reform had been a current phrase since 1786); meaning "unconventional" is from 1921.
- capital (adj[.)](http://www.etymonline.com/index.php?term=capital&allowed_in_frame=0)[](http://www.etymonline.com/index.php?allowed_in_frame=0&search=capital&searchmode=none)
- early 13c., from L. capitalis "of the head," hence "capital, chief, first," from caput (gen. capitis) "head" (see [head](http://www.etymonline.com/index.php?term=head&allowed_in_frame=0)). A capital crime (1520s) is one that affects the life or "head;"capital had a sense of "deadly, mortal" from late 14c. in English, a sense also found in Latin. The connection between "head" and "life, mortality" also existed in O.E.: e.g. heafodgilt"deadly sin, capital offense," heafdes þolian "to forfeit life." Capital punishment was in Blackstone (1765). Capital gain is recorded from 1921. Capital goods is recorded from 1899. Of ships, "first-rate, of the line," attested from 1650s. Related: Capitally.
- [capital (n.)](http://www.etymonline.com/index.php?term=capital&allowed_in_frame=0)
- early 15c., "a capital letter," from [capital](http://www.etymonline.com/index.php?term=capital&allowed_in_frame=0) (adj.). The meaning "capital city" is first recorded 1660s (the O.E. word was heafodstol). The financial sense (1610s) is from L.L. capitale"stock, property," neut. of capitalis.