The term "gear" has several meanings, depending on its context.
1) In a general sense, gear refers to any type of machinery or equipment used for a particular purpose. For example, one might say "I need to buy some gardening gear." This would refer to tools such as shovels, rakes and hoses that are needed for gardening work.
2) In the context of mechanical devices, gears are components in machinery used to transmit motion or power from one part to another. For example, a bicycle has gears which allow the rider to change the level of resistance while pedaling, making it easier or harder to ride uphill or on flat ground.
3) In an specific sense, "gear" can refer to clothing or accessories worn for a particular activity. For example, one might say "I need to buy some hiking gear." This would refer to items such as boots, backpacks and warm jackets that are needed for hiking in the outdoors.
Overall, the term "gear" can have several meanings depending on its context, but generally refers to machinery or equipment used for a particular purpose, or clothing/accessories worn for a specific activity.