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The Hebrew word yom is used in many places throughout the Old Testament, including in Genesis 1. Vines Complete Expository Dictionary has this to say about the word (bold is not in the original).
Dictionary Definition of yôm
Yôm has several meanings. The word represents the period of “daylight” as contrasted with nighttime: “While the earth remaineth, seedtime and harvest, and cold and heat, and summer and winter, and day and night shall not cease” (Gen. 8:22). The word denotes a period of twenty-four hours: “And it came to pass, as she spake to Joseph day by day . . .” (Gen. 39:10). Yôm can also signify a period of time of unspecified duration: “And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made” (Gen. 2:3). In this verse, “day” refers to the entire period of God’s resting from creating this universe. This “day” began after He completed the creative acts of the seventh day and extends at least to the return of Christ. Compare Gen. 2:4: “These are the generations of the heavens and of the earth when they were created, in the day [ bᵉyôm ] that the Lord God made the earth and the heavens. . . .” Here “day” refers to the entire period envisioned in the first six days of creation. Another nuance appears in Gen. 2:17, where the word represents a “point of time” or “a moment”: “But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day [ bᵉyôm ] that thou eatest thereof thou shalt surely die.” … The first biblical occurrence of yôm is found in Gen. 1:5: “And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.” The second use introduces one of the most debated occurrences of the word, which is the duration of the days of creation. Perhaps the most frequently heard explanations are that these “days” are 24 hours long, indefinitely long (i.e., eras of time), or logical rather than temporal categories (i.e., they depict theological categories rather than periods of time)…
The Hebrew word yom is used in many places throughout the Old Testament, including in Genesis 1. Vines Complete Expository Dictionary has this to say about the word (bold is not in the original).
Yôm has several meanings. The word represents the period of “daylight” as contrasted with nighttime: “While the earth remaineth, seedtime and harvest, and cold and heat, and summer and winter, and day and night shall not cease” (Gen. 8:22). The word denotes a period of twenty-four hours: “And it came to pass, as she spake to Joseph day by day . . .” (Gen. 39:10). Yôm can also signify a period of time of unspecified duration: “And God blessed the seventh day, and sanctified it: because that in it he had rested from all his work which God created and made” (Gen. 2:3). In this verse, “day” refers to the entire period of God’s resting from creating this universe. This “day” began after He completed the creative acts of the seventh day and extends at least to the return of Christ. Compare Gen. 2:4: “These are the generations of the heavens and of the earth when they were created, in the day [ bᵉyôm ] that the Lord God made the earth and the heavens. . . .” Here “day” refers to the entire period envisioned in the first six days of creation. Another nuance appears in Gen. 2:17, where the word represents a “point of time” or “a moment”: “But of the tree of the knowledge of good and evil, thou shalt not eat of it: for in the day [ bᵉyôm ] that thou eatest thereof thou shalt surely die.” … The first biblical occurrence of yôm is found in Gen. 1:5: “And God called the light Day, and the darkness he called Night. And the evening and the morning were the first day.” The second use introduces one of the most debated occurrences of the word, which is the duration of the days of creation. Perhaps the most frequently heard explanations are that these “days” are 24 hours long, indefinitely long (i.e., eras of time), or logical rather than temporal categories (i.e., they depict theological categories rather than periods of time)…
Vine’s Complete Expository Dictionary of Old and New Testament Words (Word Study) (pp. 54-55). Thomas Nelson. Kindle Edition.