To take in as food; eat or drink up. See Synonyms at eat. To expend; use up: engines that consume less fuel; a project that consumed most of my time and energy. To purchase (goods or services) for direct use or ownership. To waste; squander. See Synonyms at waste. To destroy totally; ravage: flames that consumed the house; a body consumed by cancer. To absorb; engross: consumed with jealousy. See Synonyms at monopolize. To be destroyed, expended, or wasted. To purchase economic goods and services: a society that consumes as fast as it produces.