noun

1. A sexual partner, especially of a breeding animal.
2. The other member of a matched pair of objects.

I found one of the socks I wanted to wear, but I couldn't find its .

1. A ship's officer, subordinate to the captain.
2. A technical assistant (gasfitter's mate).
3. checkmate, Checkmate.
4. (context, colloquial, UK, Australian) A friend; a friendly term of address to a stranger.
5. A drink prepared of yerba mate (Ilex paraguariensis).

verb (mates, mating, mated) Intransitive:

1. To fit together without space between. (The pieces of the puzzle mate perfectly.)
2. To copulate.
3. To pair in order to raise offspring

Transitive:

1. To arrange in matched pairs.
2. To introduce (animals) together for the purpose of breeding.
3. To fit (objects) together without space between.
4. To win a game of chess by putting the opponent in checkmate

adjective

1. Related to mechanics, done by machine

noun

1. (engineering) The subfield of engineering concerned with designing and building machines and mechanical systems

noun

1. (physics) The branch of physics that deals with the action of forces on material objects with mass
2. The design and construction of machines

noun (pl2=momenta)

1. (physics) (of a body in motion) the product of its mass and velocity.
2. The impetus, either of a body in motion, or of an idea or course of events.

1. • 1843, Nathaniel Hawthorne, "The Old Apple Dealer", in Mosses from an Old Manse
     
   • :The travellers swarm forth from the cars. All are full of the which they have caught from their mode of conveyance.
     
   • 1882, Thomas Hardy, Two on a Tower
     
   • :Their intention to become husband and wife, at first halting and timorous, had accumulated with the lapse of hours, till it now bore down every obstacle in its course.

noun

1. The power that enables something to move; also used in a figurative sense.
   

   • "Using electricity as motive power for railroads will do away with fuel trains, tenders, coal handling, water, and all that."