“s” vs. “z” in BE vs. AE

I have trouble understanding why some words change “s”-es to “z”-s from BE to AE and some not. For example:

  • analyse -> analyze
  • characterise -> characterize
  • hypnotise -> hypnotize

But:

  • compromise -> compromise

Is there any rule to this?

Slightly related: Why isn’t “citizen” spelled as “citisen” in British English?

Answer

Etymonline contains useful information.

-ize

suffix forming verbs, M.E. -isen, from O.Fr. -iser, from L.L. -izare, from Gk. -izein. English picked up the French form, but partially reverted to the correct Greek -z- spelling from late 16c. In Britain, despite the opposition (at least formerly) of OED, Encyclopaedia Britannica, the “Times of London,” and Fowler, -ise remains dominant. Fowler thinks this is to avoid the difficulty of remembering the short list of common words not from Greek which must be spelled with an -s- (e.g. advertise, devise, surprise).

That last list includes compromise too, as that does not have a Greek root.

The one I’ve had most contact with is baptise/baptize which comes directly from the Greek baptizein and presumably should be spelled with z.

As someone with an interest in letterforms, I’ve always found z an anomalous letter (the thick stroke goes in the wrong direction) and I far prefer the appearance of these words spelled with an s. That may also be a contributory factor (as well as Fowler’s “difficulty”), even if only subliminally.

The OED[paywalled link] provides this etymological note on the ‑ize suffix, and on how they use that suffix in that dictionary:

Etymology: Cognate with French ‑ise‑r, Italian ‑izare, Spanish
‑izar, < late Latin ‑izāre, ‑īzāre, < Greek ‑ίζειν, formative of
verbs.

The Greek verbs were partly intransitive, as βαρβαρίζειν to play the
barbarian, act or speak as a barbarian, side with the barbarians,
τυραννίζειν to side with the tyrants, partly transitive as καθαρίζειν
to purify, clean, θήσαυρίζειν to treasure up. Those formed on national,
sectarian, or personal names were primarily intransitive, as Ἀττικίζειν
to Atticize in manners, to speak Attic, Φιλιππίζειν to act or speak for
Philip, to philippize, Ἑλληνίζειν to ‘do’ the Greek, act as a Greek,
speak Greek, Hellenize; also, to make Greek. A few words of this form
connected with or used in early Christianity, were latinized already in the
3rd or 4th cent. by Christian writers: such were βαπτίζειν baptizāre,
εὐαγγελίζειν euangelizāre, κατηχίζειν catechizāre, σκανδαλίζειν
scandalizāre, ἀναθηματίζειν anathēmatizāre, χριστιανίζειν
christiānizāre, ἰουδαίζειν iūdaizāre. Others continued to be formed
both in ecclesiastical and philosophical use, e.g. canōnizāre,
daemonizāre, syllogizāre (Boethius Aristot. Anal.); and this became
established as the normal form for the latinizing of Greek verbs, or the
formation of verbs upon Greek analogies. In medieval Latin and the modern
languages these have been formed also on Latin or modern national names,
and the use has been extended to the formation of verbs from Latin
adjectives or nouns. This practice probably began first in French; in
modern French the suffix has become ‑iser, alike in words from Greek, as
baptiser, évangéliser, organiser, and those formed after them from
Latin, as civiliser, cicatriser, humaniser. Hence, some have used
the spelling ‑ise in English, as in French, for all these words, and some
prefer ‑ise in words formed in French or English from Latin elements,
retaining ‑ize for those formed < Greek elements. But the suffix itself,
whatever the element to which it is added, is in its origin the Greek
‑ιζειν, Latin ‑izāre; and, as the pronunciation is also with z, there
is no reason why in English the special French spelling should be followed,
in opposition to that which is at once etymological and phonetic. In this
Dictionary the termination is uniformly written ‑ize. (In the Greek
‑ιζ‑, the i was short, so originally in Latin, but the double consonant
z (= dz, ts) made the syllable long; when the z became a simple
consonant, /‑idz/ became īz, whence English /‑aɪz/.)

Attribution
Source : Link , Question Author : user1202136 , Answer Author : tchrist

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