The context there Aunt was the circumcised Jews trying to impede the gospel.
Phill 3:2 look to the dogs, look to the evil-workers, look to the concision;
Phill 3:3 for we are the circumcision, who by the Spirit are serving God, and glorying in Christ Jesus, and in flesh having no trust,
The concision - Κατατομην· The cutting or excision; not περιτομην, the circumcision: the word is used by the apostle to degrade the pretensions which the Jews made to sanctity by the cutting in their flesh. Circumcision was an honorable thing, for it was a sign of the covenant; but as they now had rejected the new covenant, their circumcision was rendered uncircumcision, and is termed a cutting, by way of degradation.
Paul was using a word play with concision.