Ordinal from shalowsh; third; feminine a third (part); by extension, a third (day, year or time); specifically, a third-story cell) -- third (part, rank, time), three (years old).
see HEBREW shalowsh
H7992. shelishi
שְׁלִישִׁי masculine שְׁלִישִׁית
feminine adjective ordinal number108 third; — שְׁלִישִׁי יוֺם Genesis 1:13 31t., etc. (64 t., rarely שְׁלִשִׁי); plural שְׁלִשִׁים (third 50, set of messengers, etc.) 1 Samuel 19:21; 2 Kings 1:13 4t.; הַשְּׁלִישִׁית בַּשָּׁנָה 1 Kings 18:1 4t., etc. (33 t.; sometimes שְׁלִשִׁת שְׁלִשִׁית,, etc.); = third part, a third 2 Samuel 18:2 (3 t. in verse) + 13 t., + (construct) Numbers 15:6 4t., + שְׁלִשִׁתֵיךְ (Ges§ 91l) Ezekiel 5:12 third part of thee; = third time 1 Samuel 3:8; also שְׁלִישִׁיָּה Isaiah 19:24 third (on par with other two); בַּשְּׁלִישִׁים Ezekiel 42:3 in the thirds, i.e. third story; — שׁ ׳עֶגְלַת 15:5; Jeremiah 48:34, see ׳ע p. 722. — שְׁלִישִׁ֫תָה Ezekiel 21:19 is corrupt and doubtful; Krae proposes וְשֻׁלְּשָׁה the sword shall be doubled and trebled; other conjectures in Co Toy. 1 Samuel 20:5 strike out ᵐ5 ׳הַשּׁ We Dr and others, so 20:12. 2 Samuel 23:18 read ᵑ6 הַשְּׁלשִׁם We Dr and others