Lexical Definition

‎εὐκαιρέω‎ eukairéō (yoo-kahee-reh'-o) to have opportunity G:V
from ‎εὔκαιρος‎

have leisure (convenient time), spend time.

Usage: 3 forms in 3 verses
Form Translated As     In Verse(s)
ηὐκαίρουν were spending their time Acts.17.21
εὐκαιρήσῃ he may have opportunity 1Cor.16.12
εὐκαίρουν were they able Mark.6.31

Abbott-Smith

*† εὐκαιρέω, -ῶ (= cl., εὖ σχολῆς ἔχειν; used by Polyb. and Philo; cf. Rutherford, NPhr. 205; MM, Exp., xiv),
to have leisure or opportunity I Co 16:12; c. inf., Mk 6:31; seq. εἰς, to devote one's leisure to, Ac 17:21.†

Abbott-Smith References

Book Refs
Mark 6:31
Acts 17:21
1 Corinthians 16:12

Liddell-Scott-Jones

εὐκαιρέω-έω

(late, accusative to [Refs 2nd c.AD+], have opportunity, leisure or time, [NT+3rd c.BC+]: with infinitive, οὐδὲ φαγεῖν ηὐκαίρουν [NT+3rd c.BC+]

__II τινι or εἴς τι, devote one's leisure to a thing, εὐ. τοῖς ἀθανάτοις ἑαυτοῦ [Refs 4th c.BC+]; εὐ. εἰς οὐδὲν ἕτερον .. [NT]
__III enjoy good times, prosper, [εὐκαιρέωέομαι, 2nd-1st c.BC: Posidonius Historicus 59 1st c.AD: Josephus Historicus ">Refs 2nd c.BC+]
__III.2 to be timely, [Refs 5th c.BC+]

LSJ Scripture Refs: 1Cor.16.12Mark.6.31Acts.17.21