Lexical Definition

‎בָּכַר‎ bâkar (baw-kar') to be/bear firstborn H:V
a primitive root; properly, to burst the womb, i.e. (causatively) bear or make early fruit (of woman or tree); also (as denominative from ‎בִּכּוּר‎)

make firstborn, be firstling, bring forth first child (new fruit).

1) to be born first
1a) (Piel)
1a1) to bear early, new fruit
1a2) to give the right of the firstborn
1a2a) to make as firstborn
1a2b) to constitute as firstborn
1b) (Pual)
1b1) to be born a firstling
1b2) to be made a firstling
1c) (Hiphil) one bearing her first child

See Greek: γίνομαι

Usage: 4 forms in 4 verses
Form Translated As     In Verse(s)
לְבַכֵּר֙ to treat as firstborn Deut.21.16
כְּמַבְכִּירָ֔ה like a bearing a first child Jer.4.31
יְבֻכַּ֤ר it will be born a firstling Lev.27.26
יְבַכֵּ֔ר it will bear early fruit Ezek.47.12

Brown-Driver-Briggs

[‎בָּכַר‎] verb (Late Hebrew ‎בְּכֵּר‎, Aramaic ‎בַּכֵּר‎, ; compare Arabic rise early, do anything early; , virgin, woman having her first child; Ethiopic primogenitus; Assyrian bukru, first-born, Dl§ 65, 5) —

Pi`el Imperfect ‎יְבַכֵּר‎ Ezek 47:12 Infinitive ‎לְבַכֵּר‎ Deut 21:16

1. bear early, new fruit Ezek 47:12.

2. make or constitute as first-born Deut 21:16 (denominative of ‎בכיר‎). Pu`al Imperfect ‎יְבֻכַּר‎ Lev 27:26 born or made a firstling. Hiph`il Participle f. ‎מַבְכִּירָה‎ Jer 4:31 one bearing her first child.

Brown-Driver-Briggs References

Book Refs
Leviticus 27:26
Deuteronomy 21:16
Jeremiah 4:31
Ezekiel 47:12