Dictionary entry

συντίθημι

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament with Strong's

συν-τίθημι

[in LXX: I Ki 22:13 (קשׁר), etc.;]

to place or put together, in various senses. Mid.,

(a) to observe, perceive;

(b) to determine, agree, covenant: c. inf., Lk 22:5; seq. τοῦ, c. inf., Ac 23:20; seq. ἵνα, Jo 9:22.†