Glossary of Linguistic Terms

Commissive Modality

Definition: 

Commissive modality is a deontic modality that connotes the speaker's expressed commitment, as a promise or threat, to bring about the proposition expressed by the utterance.

Discussion: 

If the usage of the term commissive modality is extended beyond solely grammaticalized means of expression, it becomes nearly synonymous with commissive illocutionary point.

Examples: 

(English)
 
All elections shall take place on schedule.

This statement is understood as the speaker’s own commitment to avoid delays.

Source: 
115–116