Hypnosis is a state of human consciousness involving focused attention and reduced peripheral awareness and an enhanced capacity for response to suggestion. The term may also refer to an art, skill, or act of inducing hypnosis. Theories explaining what occurs during hypnosis fall into two groups. Altered state theories see hypnosis as an altered state of mind or trance, marked by a level of awareness different from the ordinary conscious state. In contrast, nonstate theories see hypnosis as a form of imaginative role-enactment.
tercet. n. 1. (Poetry) a group of three lines of verse that rhyme together or are connected by rhyme with adjacent groups of three lines. [C16: from French, from Italian terzetto, diminutive of terzo third, from Latin tertius ].
A couplet is a two-line stanza; if the two lines rhyme it is called a rhyming couplet. A tercet or triplet is a three-line stanza. A quatrain is a four-line stanza. Sometimes a stanza is called a verse or a stroph. The meaning is essentially the same, but stanza is the far more popular term. The important thing to remember is that, except when you are using a set form, you have a great deal of leeway in how you use stanzas.