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Dating: this is casual dating and is rarely exclusive. It is typically done in groups and involves talking, hanging out and flirting.
Promise gift: this is an object that breaks into two perfect halves. Each half has some indication of who in the pairing it goes with. If the recipient returns the half with their marker on it they have accepted the proposal to become serious and one-on-one dating. Returning it all is refusing a more serious relationship while returning none is considered a cowardly way of breaking things off completely.
Serious dating: Exclusive and cheating is a big deal.
Horn accessory Engagement. This is a piece of jewelry that rest on the sensor horn. Most mecha make them a permanent horn inlay after bonding.
Conjunx: legally 'bonded', filed with the government for spousal rights and typically celebrated with parties and a ceremony.
Conjunx endura: spark bonded and more filing with the government. While there may be a ceremony or celebration involved it is not expected.