1590s, "reflect upon, ponder, study, view mentally, meditate," from Latin contemplatus, past participle of contemplari "to gaze attentively, observe; consider, contemplate," originally "to mark out a space for observation" (as an augur does), from assimilated form of com-, here perhaps an intensive prefix (see com-), + templum "area for the taking of auguries" (see temple (n.1)).
From c. 1600 as "to view or observe with continued attention." From 1816 as "to intend, have in view as a future act." Related: Contemplated; contemplating.
early 15c., "act of looking into the distance, condition of facing something else or a certain direction," from Latin prospectus "distant view, look out; sight, faculty of sight," noun use of past participle of prospicere "look out on, look forward," from pro "forward" (see pro-) + specere "look at" (from PIE root *spek- "to observe").
The meaning "extensive view of the landscape, view of things within the reach of the eye" is from 1530s; transferred sense of "mental view or survey" is from 1620s. The meaning "that which is presented to the eye, scene" is from 1630s.
The sense of "person or thing considered promising" is from 1922, from the earlier sense of "expectation, ground of expectation," especially of advantage (1660s) on the notion of "looking forward," hence "anticipation." Hence prospects "things looked forward to." The meaning "a wide, long, straight street or avenue" is by 1866, in a Russian context, and thus often spelled prospekt.
"scenery view," 1773, abstracted from landscape (n.); -scape as a combining element in word formation is attested by 1796, in prisonscape.
1926 (pansexualism is from 1917), from pan- + sexual. Originally in reference to the view that the sex instinct plays the primary part in all human activity, mental and physical; Freud's critics held this to be his view, and the word became a term of reproach leveled at early psychology. Meaning "not limited in sexual choice" is attested by 1972. Related: Pansexuality.