Etymology
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Words related to explore

exploration (n.)

"act of exploring, examination, or investigation," especially for the purpose of discovery and specifically of an unknown country or part of the earth, 1540s, from French exploration and directly from Latin explorationem (nominative exploratio) "an examination," noun of action from past-participle stem of explorare "investigate, examine" (see explore). Alternative explorement is from 1640s.

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ex- 
word-forming element, in English meaning usually "out of, from," but also "upwards, completely, deprive of, without," and "former;" from Latin ex "out of, from within; from which time, since; according to; in regard to," from PIE *eghs "out" (source also of Gaulish ex-, Old Irish ess-, Old Church Slavonic izu, Russian iz). In some cases also from Greek cognate ex, ek. PIE *eghs had comparative form *eks-tero and superlative *eks-t(e)r-emo-. Often reduced to e- before -b-, -d-, -g-, consonantal -i-, -l-, -m-, -n-, -v- (as in elude, emerge, evaporate, etc.).
deplore (v.)

1550s, "to give up as hopeless, despair of," a sense now obsolete, from French déplorer (13c.), from Latin deplorare "deplore, bewail, lament, give up for lost," from de- "entirely" (see de-) + plorare "weep, cry out," which is of unknown origin. Meaning "to regret deeply" is from 1560s. Related: Deplored; deploring.

exploratory (adj.)

mid-15c., "intended for exploration or scouting," from Latin exploratorius "belonging to scouts," from explorator "scout," from explorare "investigate, examine" (see explore). Alternative explorative is from 1738; explorational is from 1889.

explorer (n.)
1680s, agent noun from explore. Replaced earlier exploratour (mid-15c.).
unexplored (adj.)
1690s, from un- (1) "not" + past participle of explore (v.).