Mark 13:4συντελεῖσθαι
“Tell us, when will these things happen? And what will be the sign that they are about to be fulfilled?”
Luke 4:2συντελεσθεισῶν
where for forty days He was tempted by the devil. He ate nothing during those days, and when they had ended, He was hungry.
Acts 21:27συντελεῖσθαι
When the seven days were almost over, some Jews from the province of Asia saw Paul at the temple. They stirred up the whole crowd and seized him,
Romans 9:28συντελῶν
For the Lord will carry out His sentence on the earth thoroughly and decisively.”
Hebrews 8:8συντελέσω
But God found fault with the people and said: “Behold, the days are coming, declares the Lord, when I will make a new covenant with the house of Israel and with the house of Judah.

Abbott-Smith

συν-τελέω, -ῶ
[in LXX chiefly for כָּלָה pi., also for עָשָׂה, תָּמַם, etc. ;]
"perfective" of τελέω (cf. M, Pr., 118),

1. to complete, finish, bring to an end: Luk.4:13; pass., Luk.4:2, Jhn.2:3, WH, mg., Act.21:27.

2. to effect, accomplish, bring to fulfilment (cf. MM, xxiv): Mrk.13:4, Rom.9:28, Heb.8:8.†
(AS)

Sources: Abbott-Smith’s Manual Greek Lexicon of the New Testament (1922, public domain) and glosses from STEPBible TBESG (CC BY 4.0); STEPBible TAGNT (Greek New Testament, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.