Militarism is commonly defined as a political and ideological belief that emphasizes the importance of maintaining a strong military capability and readiness to use it aggressively to defend or promote national interests. It often involves the glorification of military power and values, the prioritization of military solutions to conflicts, and the influence of military leaders and organizations on governmental and societal affairs. This perspective can lead to increased military spending, the prioritization of military over social needs, and a general culture that promotes military values and heroism.
Note that specific definitions may vary slightly depending on the context and the source, but this definition captures the essential elements of the concept.