Liquid crystal compound, liquid crystal composition, and liquid crystal display device

A compound represented by Formula (1):

• wherein Ra and Rb each independently is hydrogen or linear alkyl having 1 to 20 carbon atoms;
• in the alkyl, arbitrary —CH2— may be replaced by —O—, or —CH═CH and arbitrary hydrogen may be replaced by fluorine;
• ring A1 is 1,4-cyclohexylene, 1,4-phenylene, pyridine-2,5-diyl, pyridazine-3,6-diyl, decahydronaphthalene-2,6-diyl, 1,2,3,4-tetrahydronaphthalene-2,6-diyl, 5,6,7,8-tetrahydronaphthalene-2,6-diyl, or naphthalene-2,6-diyl;
• arbitrary —CH2— constituting the rings may be replaced by —O—, and arbitrary hydrogen directly bonded to the rings may be replaced by fluorine, —CF3, —CHF2, —CH2F, —OCF3, —OCHF2, or —OCH2F;
• Z1 is a single bond or alkylene having 1 to 4 carbon atoms;
• in the alkylene, arbitrary —CH2— may be replaced by —O—, —CO—, —CH═CH—, —CF═CF—, or —C≡C—, and arbitrary hydrogen may be replaced by fluorine;
• Y1 is hydrogen, fluorine, chlorine, —CF3, —CHF2, —CH2F, —OCF3, —OCHF2, or —OCH2F;
• and
• m is 1, 2, or 3;
• and when m is 2 or 3, plural rings A1 may be identical groups or different groups, and plural Z1 may be identical groups or different groups.