Mostly used in military contexts to describe items like weapons and uniforms. The military base was stocked with ample materiel for the troops.
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Not Personnel
Don't confuse 'materiel' with 'personnel'. Materiel is items, personnel are people. While personnel were ready for the mission, they were waiting on the materiel.
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Technical Term
It's a technical term mainly used in logistical operations not everyday conversation. The procurement officer managed the delivery of materiel efficiently.