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The term that describes an act of stopping ongoing actions is "suspension". It specifically refers to the temporary halt or interruption of an activity or process. This can pertain to various contexts, such as the suspension of a project, a procedure, or an agreement where actions that were previously occurring come to a standstill.

In contrast, the other terms carry different meanings. Initiation refers to the beginning or start of an action or process, which is the opposite of stopping something. Operation indicates the functioning or working of something, not stopping it. Execution typically refers to the carrying out or performance of an action, which is again contrary to the idea of stopping. Thus, suspension is the most accurate choice for describing the act of halting ongoing actions.