English Reference
adjective

operational

adj.
US /ˌɑpɝˈeɪʃənəɫ/ UK /ˌɒpəɹˈeɪʃənəl/ op·er·a·tional

  1. 01 B2 Upper Intermediate

    working correctly and ready to be used.

    functioning and ready for immediate use; in a state of practical readiness.

    Simple

    The new hospital wing will be fully operational by the end of the month.

    In context

    Engineers worked through the night to ensure the power grid was fully operational before the morning commute began.

  2. 02 C1 Advanced Academic

    relating to the daily activities or costs of running a business or organisation.

    pertaining to the routine activities, processes, or costs involved in running an organisation.

    Simple

    The company is looking for ways to reduce its daily operational costs.

    In context

    The board focused on long-term strategy, leaving the day-to-day operational decisions to the local branch managers.

  3. 03 C1 Advanced Formal

    relating to planned military actions or missions.

    relating to the planning and execution of specific military operations.

    Simple

    The general refused to comment on current operational details for security reasons.

    In context

    The mission was aborted due to a significant breach in operational security that compromised the safety of the ground team.

  4. 04 C2 Proficiency AcademicTechnical Science

    defined by how something is measured or used in practice.

    defined in terms of the specific actions or operations used to measure or identify it.

    Simple

    The researchers needed an operational definition of 'happiness' for their study.

    In context

    Before the experiment could proceed, the team had to establish an operational framework for measuring cognitive load under stress.

Usage operational control · operational tempo · operational level

Ullman told Al Jazeera that ships require onshore care to keep advanced technology operational over long periods.

Al Jazeera· 14 Aug 2026

It had faced "sustained trading and operational challenges" recently and Frasers Group said it will need to conduct a review of the store's portfolio, structure and cost base.

BBC News· 13 Aug 2026

From operation + -al.

Etymology adapted from Wiktionary, available under CC BY-SA 4.0.

This entry
Level C1 · Advanced
Frequency Common
Updated