“Ionized” or “Ionised”—What's the difference?

“Ionized” or “Ionised”

Language

Ionized and ionised are both English terms.

Usage

Ionized is predominantly used in 🇺🇸 American (US) English (en-US) while ionised is predominantly used in 🇬🇧 British English (used in UK/AU/NZ) (en-GB).

In terms of actual appearance and usage, here's a breakdown by country, with usage level out of 100 (if available):

Term	US	UK	India	Philippines	Canada	Australia	Liberia	Ireland	New Zealand	Jamaica	Trinidad & Tobago	Guyana
ionized	99	30	61	100	97	37	0	43	40	0	100	0
ionised	1	70	39	0	3	63	0	57	60	0	0	0

In the United States, there is a preference for "ionized" over "ionised" (99 to 1).
In the United Kingdom, there is a 70 to 30 preference for "ionised" over "ionized".
In India, there is a preference for "ionized" over "ionised" (61 to 39).
In the Philippines, there is a preference for "ionized" over "ionised" (100 to 0).
In Canada, there is a preference for "ionized" over "ionised" (97 to 3).
In Australia, there is a 63 to 37 preference for "ionised" over "ionized".
In Liberia, there is not enough data to determine a preference between "ionized" and "ionised".
In Ireland, there is a 57 to 43 preference for "ionised" over "ionized".
In New Zealand, there is a 60 to 40 preference for "ionised" over "ionized".
In Jamaica, there is not enough data to determine a preference between "ionized" and "ionised".
In Trinidad & Tobago, there is a preference for "ionized" over "ionised" (100 to 0).
In Guyana, there is not enough data to determine a preference between "ionized" and "ionised".

Examples

Below, we provide some examples of when to use ionized or ionised with sample sentences.

Trends

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Examples in Context

Examples of “ionized”

…the discharge chamber and are ionized by electron bombardment, forming a
…liquid mobile phase are often ionized by various soft ionization methods…
…MHz are reflected by an ionized layer in the Earth's atmosphere…
…intensely heated by friction between ionized gas in faster-moving inner orbits…
…traditions, hospitality, climatic areas and ionized maritime air.
…portion of the particles are ionized.
…any active vents, plumes, and ionized plasma trails, the strength of…
…not yet become hot and ionized.
…of isotopes that will be ionized, as well as detected, so…
…sound generators, special lighting, and ionized gas.

Examples of “ionised”

…explosion of nitrogen molecules multiply ionised by a laser pulse.
…region where the atmosphere is ionised by incoming solar radiation.
…arms indicates the presence of ionised hydrogen and clusters of massive…
…that they were caused by ionised helium, helium atoms with only…
…few hundreds of molecules are ionised at each laser pulse, the…
…Kennelly–Heaviside layer, a layer of ionised gas that reflects radio waves…
…spectral lines arise instead from ionised helium, He+.
…a particularly strong 468.6 nm ionised helium line.
…He+ emission lines and certain ionised nitrogen and silicon lines.
…molecular hydrogen and around of ionised hydrogen, all expelled from the

(Examples are Wikipedia snippets under the CC ShareAlike 3.0 license.)

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