A linear series of pitches; horizontal
A musical sentence (phrase/theme); the part you sing!
Derived from scales (a set collection of pitches; major or minor tonality)
Conjunct melody:  pitches are close together; easy to sing
Disjunct melody:  pitches are spread apart; difficult to sing
Range: the distance between the lowest and highest notes of a melody
Motive:  a short musical phrase or recurring melodic fragment;  can also be a collection of pitches or a recurring rhythmic pattern
Leitmotif: a recurrent theme (melody or motive) throughout a musical composition, associated with a particular person, idea, place, emotion, etc.

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