English Reference
noun

initiation

n.
US /ˌɪˌnɪʃiˈeɪʃən/ UK /ɪnˌɪʃɪˈeɪʃən/ ini·ti·a·tion UK spelling initiations

  1. 01 B2 Upper Intermediate

    the act of starting a new plan, process, or activity.

    the act of beginning or originating a process, project, or sequence of events.

    Simple

    The initiation of the new safety rules helped reduce accidents at the factory.

    In context

    The rapid initiation of emergency protocols prevented the minor technical glitch from escalating into a full-scale system failure.

    Usage

    Often followed by the preposition 'of'.

  2. 02 B2 Upper Intermediate

    a ceremony or set of actions that someone must complete to join a club or organization.

    a formal ritual or set of requirements marking the admission of an individual into a specific group, society, or order.

    Simple

    The club has a secret initiation for all new members.

    In context

    The university fraternity faced heavy criticism after reports surfaced regarding the dangerous nature of their annual initiation rites.

    Teacher's tip

    In modern contexts, this often refers to university clubs or professional organizations, but it can also describe traditional tribal or religious ceremonies.

  3. 03 C1 Advanced Technical Science

    the very first step in a chemical reaction or a biological process.

    the preliminary stage of a chemical reaction or a molecular process such as transcription or translation.

    Simple

    The initiation of the reaction requires a small amount of heat.

    In context

    The research team focused on the initiation phase of protein synthesis to understand how certain genetic mutations occur.

    Usage

    Commonly used in biochemistry and polymer chemistry to describe the start of a chain reaction.

Doctor Ternhamar concluded: "In individuals developing type 2 diabetes, statins were associated with a lower risk of dementia, most pronounced in those with early initiation.

ScienceDaily· 8 Sept 2026

But his vampire family still don’t know he’s actually a human and they want him to pass his initiation ceremony in front of the whole community of Katchem-By-the-Throat.

The Guardian· 28 Aug 2026

Borrowed from Middle French initiation, from Latin initiātiō. Morphologically initiate + -ion.

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

This entry
Origin Latin initiātiō
Level C1 · Advanced
Frequency Frequent
Updated