Hebrew

Adverb

אַךְ • ‎(akh)

1. Only.
   • a. 450 BCE, Exodus 10:17:

     וְעַתָּה שָׂא נָא חַטָּאתִי אַךְ הַפַּעַם וְהַעְתִּירוּ ה׳ אֱלֹקֵיכֶם וְיָסֵר מֵעָלַי רַק אֶת־הַמָּוֶת הַזֶּה׃

     Now therefore forgive, I pray thee, my sin only this once, and entreat the LORD your God, that he may take away from me this death only.^[1]

2. Now, just, hardly.
   • c. 1000–400 BCE, Genesis 27:30:

     וַיְהִי כַּאֲשֶׁר כִּלָּה יִצְחָק לְבָרֵךְ אֶת־יַעֲקֹב וַיְהִי אַךְ יָצֹא יָצָא יַעֲקֹב מֵאֵת פְּנֵי יִצְחָק אָבִיו וְעֵשָׂו אָחִיו בָּא מִצֵּידוֹ׃

     And it came to pass, as soon as Isaac had made an end of blessing Jacob, and Jacob was yet scarce gone out from the presence of Isaac his father, that Esau his brother came in from his hunting.^[1]

Conjunction

אַךְ • ‎(akh)

1. But.
   • (Can we date this quote?) 1 Samuel 20:39:

     וְהַנַּעַר לֹא־יָדַע מְאוּמָה אַךְ יְהוֹנָתָן וְדָוִד יָדְעוּ אֶת־הַדָּבָר׃

     But the lad knew not any thing: only Jonathan and David knew the matter.^[1]

References

• “אַךְ” in Abraham Even-Shoshan (אַבְרָהָם אֶבֶן־שֹׁשָן) et al., הַמִּלּוֹן הֶחָדָשׁ ‎(ha-milón he-khadásh, “The New Dictionary”), Kiryat-Sefer Ltd. (קִרְיַת־סֵפֶר בְּע״ם)‎ (1984), ISBN 965-17-0084-X, volume 1 of 3 (א to כ), ISBN 965-17-0095-5, page 44.
• Notes:

1. 1 2 3 Authorized King James translation (1611).

Yiddish

Interjection

אך • ‎(akh)

1. (nonstandard) Unpointed form of אַך ‎(akh).