1. the quality or state of being extemporaneous; the act of speaking, performing, or composing without prior preparation or planning.
Usage: formal; often used in academic or rhetorical contexts

Examples

• The speaker's extemporaneity impressed the audience, even though she had no notes.
• Jazz musicians are known for their extemporaneity and creative improvisation.
• The extemporaneity of the performance gave it an authentic, unrehearsed quality.
• His extemporaneity in conversation made him a natural public speaker.
• The debate required extemporaneity since contestants had only minutes to prepare their arguments.
• She valued extemporaneity in her teaching style, often departing from the lesson plan to address student questions.