se-

prefix apart, without (seclude; secure).
Etymology: L f. OL se (prep. & adv.)

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a prefix occurring in loanwords from Latin, where it meant "apart": seduce; select.

[ < L se(d) (prep.), se- (prefix) without, apart]

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prefix (in words adopted from Latin) apart; without

secede | secure

Origin:

from Latin se-, from the earlier preposition and adverb se

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se-, prefix

occurring only in Latin derivatives, represents the L. sē-, identical with the OLatin sē (also sēd) prep. and adv., without, apart. With prepositional force the L. sē- occurs in one or two adjs., as sēcūrus secure (from *sē cūrā without care); with advb. force (= apart) it is chiefly found in verbs, of which the following (as also their derivatives) have come into English in adapted forms: sēcēdĕre, sēcernĕre, sēclūdĕre, sēdūcĕre, sēgregāre, sēparāre. The form sēd- occurs in sēditio sedition (lit. ‘going apart’).

The L. sē, sēd is believed to be related to the pronoun sē, oneself. It is disputed whether the d of sēd is an ablative sign or represents a particle -de.