; from Greek πλεονασμός (pleonasmós), from πλέον (pleon), meaning 'more, too much') is the use of more words or parts of words than are necessary or sufficient for clear expression: for example black darkness or burning fire.

Adventures may be activities with some potential for physical danger such as traveling, exploring, skydiving, mountain climbing, scuba diving, river rafting or participating in extreme sports.

The term also broadly refers to any enterprise that is potentially fraught with physical, financial or psychological risk, such as a business venture, or other major life undertakings. For some people, adventure becomes a major pursuit in and of itself.

There are many sports classified as adventure sports, due to their inherent danger and excitement.

Some of these include mountain climbing, skydiving, or other extreme sports.

They are so common that their use is unremarkable and often even unnoticeable for native speakers, although in many cases the redundancy can be dropped with no loss of meaning.

When expressing possibility, English speakers often use potentially pleonastic expressions such as It may be possible or maybe it's possible, where both terms (verb may/adverb maybe and adjective possible) have the same meaning under certain constructions.For example, a speaker who is too terse is often interpreted as lacking ease or grace, because, in oral and sign language, sentences are spontaneously created without the benefit of editing.The restriction on the ability to plan often creates much redundancy.The knight errant was the form the "adventure seeker" character took in the late Middle Ages.The adventure novel exhibits these "protagonist on adventurous journey" characteristics as do many popular feature films, such as Star Wars Adventure books may have the theme of the hero or main character going to face the wilderness or Mother Nature.Mythologist Joseph Campbell discussed his notion of the monomyth in his book, The Hero with a Thousand Faces.