Usage: 2 forms in 2 verses
Form Translated As     In Verse(s)
υπόμνημα record LXX.Ezra.6.2
υπομνημάτων recording LXX.2Sam.8.16

Liddell-Scott-Jones

ὑπόμνημα (hupomnēma) a record G:N-N

ὑπόμνημα, ατος, τό,

reminder, memorial, ἔχειν ὑπομνήματά τινος [Refs 5th c.BC+]; τοιούτοις χρώμενος ὑπομνήμασιν such means of remembrance, [Refs 5th c.BC+]

__2 tomb, [Refs]
__II reminder, mention, in a speech, [Refs 5th c.BC+]; in a letter, [Refs 5th c.BC+]; especially written reminder, memorandum, . Ζήνωνι παρὰ Διονυσίου, τῷ φέροντί σοι τὸ ., [Refs 3rd c.BC+]
__II.2 note or memorandum entered by a tradesman in his day-book, ὑπόμνημα ἀπεγράψατο he had a note made of it, [Refs 4th c.BC+]; of bankers, εἰώθασιν ὑπομνήματα γράφεσθαι ὧν διδόασι χρημάτων.. [Refs]
__II.3 mostly in plural, memoranda, notes, [Refs 5th c.BC+]; . γράφειν, γράψασθαι, [Refs]
__II.4 minutes of the proceedings of a public body, public records, τὰ κατ᾽ ἄρχοντας . [Refs 1st c.BC+]; τὰ τῆς βουλῆς . the acts of the Senate, [Refs 2nd c.AD+]; ἐπὶ τῶν . τῆς συγκλήτου, = Latin a commentariis, [Refs 2nd c.AD+]; ἐπὶ τῶν . καταστῆσαί τινα [LXX+1st c.AD+]; records of a magistrate, [Refs 3rd c.AD+]; including his decisions, Mitteis [Refs 2nd c.AD+]
__II.5 dissertations or treatises written by philosophers, rhetoricians, and artists, [Refs 4th c.BC+]; of historical or geographical works, [Refs 2nd c.BC+]; of medical works, [Refs 2nd c.AD+]
__II.5.b division, section, 'book' of such a treatise, [Refs 1st c.BC+]
__II.5.c explanatory notes, commentaries, [Refs 5th c.BC+]; of the Homeric commentaries of [Refs 8th c.BC+]; εἰ γὰρ τὰ συγγράμματα (Aristarchus' independent treatises on Homeric questions) τῶν ὑπομνημάτων προτάττοιμεν.. [Refs 8th c.BC+] (clinical notes) from συγγράμματα of Hippocrates, 16.532,543; and the συγγράμματα of [Refs 5th c.BC+] from his own commentaries (ὑπομνήματα) on them, [Refs]; commentary, οὕτω Θέων ἐν . τῷ εἰς Θεόκριτον Et.Gud.d. see at {γρῖπος}.
__III draft or copy of a letter, [Refs 5th c.BC+]
__IV memorial, petition, addressed to a magistrate, whereas the ἔντευξις [Refs] is in form addressed to the king, [Refs 3rd c.BC+]
__IV.2 notification, e.g. of birth, [Refs 2nd c.AD+]; of removal, [Refs 1st c.AD+]

LSJ Scripture Refs: LXX.2Kgs.8.16