Etymology
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Words related to subsidize

subsidy (n.)
late 14c., from Anglo-French subsidie, Old French subside "help, aid, assistance, contribution," from Latin subsidium "a help, aid, assistance, (military) reinforcements, troops in reserve," from subsidere "to settle down, stay, remain" (see subside).
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-ize 

word-forming element used to make verbs, Middle English -isen, from Old French -iser/-izer, from Late Latin -izare, from Greek -izein, a verb-forming element denoting the doing of the noun or adjective to which it is attached.

The variation of -ize and -ise began in Old French and Middle English, perhaps aided by a few words (such as surprise, see below) where the ending is French or Latin, not Greek. With the classical revival, English partially reverted to the correct Greek -z- spelling from late 16c. But the 1694 edition of the authoritative French Academy dictionary standardized the spellings as -s-, which influenced English.

In Britain, despite the opposition to it (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- (such as advertise, devise, surprise). American English has always favored -ize. The spelling variation involves about 200 English verbs.

subsidise (v.)
chiefly British English spelling of subsidize. For suffix, see -ize. Related: Subsidised; subsidising.
unsubsidized (adj.)
1756, from un- (1) "not" + past participle of subsidize (v.).