Strong’s Greek
G4593 — semeioo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
σημειόομαι
semeioo — pronounced say-mi-o'-o
from 4592; to distinguish, i.e. mark (for avoidance):--note. see GREEK for 4592
1 occurrence in the KJV.
2 Thessalonians 3:14
And if any man obey not our word by this epistle, note that man, and have no company with him, that he may be ashamed.