adv · conj · 4 senses · updated from the 2026-07-25 local source snapshot
Definitions and examples are grouped by meaning. Pronunciation, history, word forms, translations, descendants, synonyms, antonyms, derived terms, and related words appear whenever the source provides them.
Sound
Pronunciation
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Received-Pronunciation, US:/ˌdʒʌst ɪn ˈkeɪs/
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Australia:Recorded audio is listed in the source snapshot.
1
adv
Meaning 1
To provide for a possible event as a precaution.
Definition source: English Wiktionary via Wiktextract
Usage: informal, not-comparable
Examples
I'll take an umbrella, just in case.
Meaning relationships
Synonyms: to be on the safe side
Antonyms: none provided
2
conj
Meaning 2
To provide for the possible event that.
Definition source: English Wiktionary via Wiktextract
Examples
I'll take an umbrella, just in case it rains.
1629, Roger Williams et al., The Correspondence of Roger Williams, Brown University Press (reprinted 1988, →ISBN, page 204, Dudley and his council "gave no credit to these suspicions" but decided to strengthen the colony's defenses just in case the rumors turned out to be true.
1981, John H. G. Pell, "General George Washington's Visit to Fort Ticonderoga in July 1783", Bulletin of the Fort Ticonderoga Museum, Volume XIV, Number 1, Summer 1981, Fort Ticonderoga Museum, page 260, Throughout 1782 and most of 1783 there was a mixture of defacto [sic] peace but preparedness for war just in case it should be resumed, a sort of cold war.
Meaning relationships
Synonyms: in the event that
Antonyms: none provided
3
conj
Meaning 3
Synonym of if and only if.
Definition source: English Wiktionary via Wiktextract
