A primitive root (ident. With ashar); to accumulate; but used only as denominative from eser; to tithe, i.e. To take or give a tenth -- X surely, give (take) the tenth, (have, take) tithe(-ing, -s), X truly.
see HEBREW ashar
see HEBREW eser
[עָשַׂר] verb denominative take the tenth of, tithe; —
Pi`el Imperfect + Infinitive absolute give a tenth of, with accusative of thing: 2 masculine singular תְּעַשֵּׂר עַשֵּׂר Deuteronomy 14:22; 1singular לָ֑ח אֲעַשְּׂרֶנּוּ עַשֵּׂר Genesis 28:22 (P); Participle taking the tenth, הַמְעַשְּׂרִים Nehemiah 10:38.
Hiph`il (so usually explained) Infinitive לַעְשֵׂר Deuteronomy 26:12 with accusative of congnate meaning with verb i.e. taking, reckoning, tithe, but Infinitive construct with ֵ֯ improbable, < read לְעַשֵּׂר
Pi`el; בַּעְשֵׂר Nehemiah 10:39 absolute, i.e. receiving tithes, but read probably בַּעְשׂר
Qal (on anomalous points, see Ges§ 53k DrDeuteronomy 26:12).