vi·car·i·ous [vīˈkerēəs] adj. Felt or undergone as if one were taking part in the experience or feelings of another.
Synonyms: substitute, surrogate, empathetic
Etymology: 1630s, from Latin vicarius "substitute, deputy" (adj. and n.), from vicis "turn, change, exchange, substitution," from PIE root *weik-, *weig- "to bend, wind" (cf. Sanskrit visti "changing, changeable;" Old English wician "to give way, yield," wice "wych elm;" Old Norse vikja "to bend, turn;" Swedish viker "willow twig, wand;" German wechsel "change"). Related: Vicariously.
I believe the root, which is even earlier, is Vicar: c.1300, from Old French vicaire, from Latin vicarius "substitute, deputy," noun use of adj. vicarius "substituting," from vicis "change, turn, office" (see vicarious). The original notion is of "earthly representative of God or Christ;" but also used in sense of "person acting as parish priest in place of a real parson" (early 14c.).
Words are so cool. We're nearing the end now. How is everyone faring?