The formal beginning or initiation of any movement, enterprise, event etc.
The act of inaugurating, or inducting into office with solemnity; investiture by appropriate ceremonies.
A setting about; a beginning.
The initial portion of a syllable, preceding the syllable nucleus.
The beginning of a musical note or other sound, in which the amplitude rises from zero to an initial peak.
The initial phase of a disease or condition, in which symptoms first become apparent.