The lowest partial of a complex tone.
The lowest frequency of a periodic waveform.
A main or major principle, rule, law, etc. which serves as the foundation or basis of a system; an essential part
Related to a foundation. base, or basis; serving as a foundation.
essential; extremely important
The note on which a musical key is based; the tonic.
The main theme of a speech, a written work, or a conference.
A speech that sets the main theme of a conference or other gathering; a keynote speech or keynote address.
To deliver a speech that sets the main theme of a conference or other gathering.