An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

1a) A state of mind in which one is troubled; worry, anxiety, or concern; a cause or object of worry, anxiety, concern, etc.
1b) Serious attention; solicitude; heed; caution.
2a) To be concerned or solicitous; have thought or regard.
2b) To be concerned or have a special preference (Dictionary.com).

M.E., from O.E. caru, cearu "sorrow, anxiety, grief," cognate with Gothic kara, O.H.G. chara lament; M.En. caren, O.E. cearian, carian "be anxious, grieve."

Timâr "care, attendance on the sick; custody; sorrow;" Mid.Pers. têmâr "care; grief"

1) Cautious in one's actions.
2) Taking pains in one's work; exact; thorough.
3) (of things) Done or performed with accuracy or caution (Dictionary.com).

→ care; + -ful, a suffix meaning "characterized by; full of; able to;" → full.

In an → isolated system, any initial state will occur again in the course of the → evolution of the system over a sufficiently long but finite → time.

→ Poincaré sphere; → recurrence; → theorem.

A representation that permits an easy visualisation of all different states of → polarization of a vector wave. The equator represents → linear polarization; the north pole corresponds to right-circular and the south pole to left- → circular polarization.

Named after Henri Poincaré (1854-1912), French mathematician and theoretical physicist, and a philosopher of science; → sphere.