Strong's Concordance

Original word: εὐκαίρως
Transliteration: eukairós
Definition (short): opportune
Definition (full): in season

NAS Exhaustive Concordance

Word Origin: adverb from eukairos
Definition: in season
NASB Translation: opportune time (1), season (1).
NAS Exhaustive Concordance of the Bible with Hebrew-Aramaic and Greek Dictionaries.
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Strong's Exhaustive Concordance

Adverb from eukairos; opportunely -- conveniently, in season.

see GREEK eukairos

KJV: And when they heard it, they were glad, and promised to give him money. And he sought how he might conveniently betray him.
NASB: They were glad when they heard this, and promised to give him money. And he began seeking how to betray Him at an opportune time.
KJV: Preach the word; be instant in season, out of season; reprove, rebuke, exhort with all longsuffering and doctrine.
NASB: preach the word; be ready in season and out of season; reprove, rebuke, exhort, with great patience and instruction.