Usage: 5 forms in 5 verses
Form Translated As     In Verse(s)
σύλληψισ seizing LXX.Job.18.10
σύλληψίν seize LXX.Jer.18.22
συλλήψεωσ conception LXX.Jer.20.17
συλλήψεων conceptions LXX.Hos.9.11
συλλήψει by seizure LXX.Jer.34.3

Liddell-Scott-Jones

σύλληψις (sullēpsis) a seizing G:N-F

σύλληψις, εως, ,

Ionic dialect σύλλαψις variant in [Refs 1st c.AD+]:— taking together, conjunction, of sounds, [Refs 2nd c.AD+]; of two consonants, [Refs]; inclusion, comprehension, [Refs 2nd c.AD+]; συλλήψεως ἐπιρρήματα (e.g. ἅμα) [Refs 2nd c.BC+]; summing up, τῶν ἀποδείξεων [Refs]; compendious statement, σ. διὰ βραχέων τῆς ὅλης θεωρίας [Refs 2nd c.AD+]

__2 Rhet., a figure by which a predicate belonging to one subject is attributed to several, [Refs 5th c.BC+]
__2.b κατὰ-ψιν ὅρος, i.e. embracing the adversary's counterplan as well as the original plan, [Refs 4th c.BC+]
__II seizing, laying hold of, arresting, apprehending, λῃστῶν ξ. [Refs]; τὴν ξύλληψιν ποιεῖσθαι arrest, [Refs 5th c.BC+]
__III conception, pregnancy, [Refs 4th c.BC+]; ἐν τῇ μῃτρὶ Ῥωμύλου σ. [Refs 1st c.AD+]; ἀκόλαστοι σ. [Refs 3rd c.AD+]
__IV taking part with another, assistance, [Refs 1st c.AD+]