Yaʿad (H3259) means to set an appointment — a scheduled meeting at a designated time and place. It underlies the important noun moed (H4150, appointed season/meeting). The Tent of Meeting (ohel moed) takes its name from this root: the tabernacle is where God meets by appointment.
The moed-appointments of Israel (Sabbath, Passover, Pentecost, Tabernacles) are not merely religious holidays — they are divine appointments built into creation's calendar. God uses time itself to summon his people. The New Testament reveals that each moed pointed forward to Christ: Passover to the cross, Firstfruits to resurrection, Pentecost to the Spirit's coming.