Step 1: Trace the Latin origin of the word Extempore.
"Extempore" comes from the Latin phrase "ex tempore" meaning "out of the moment" or "without time to prepare"; it refers to something done instantly without any prior planning.
Step 2: Define an extempore speech.
An extempore speech is delivered on the spot with no notes, outline, or script - the speaker thinks and speaks simultaneously without preparation.
Step 3: Select the correct option.
"Speech without preparation" is the exact definition; options (2), (3), and (4) all involve some degree of preparation or a script, which is the opposite of extempore.
\[ \boxed{\text{Speech without preparation}} \]